Skip dataset verifications by default
_The documentation is not available anymore as the PR was closed or merged._ 100% agree that the checksum verification is overkill and not super useful. But I think this PR would also disable the check on num_examples no ?
 
As a user I would like to know if the dataset I'm loading changed significantly.
And I also think it can be useful to make sure the metadata are up to date.

What do you think ?

We could have a default `ignore_verifications="ignore_checksums"` > We could have a default `ignore_verifications="ignore_checksums"`

Accepting multiple types (booleans and strings) at the same time is not the best design. Maybe we could define an enum for this parameter? Yes an enum sounds good ! so we can have three verification levels, - smth like "ignore_all" (to skip both checksums and all other info like num_examples verification), "ignore_checksums" (to skip only checksums verification), and "verify_all" (to perform all verification)?
and deprecate `ignore_verifications` param.

@mariosasko if you're not going to work on this PR in the coming days, I can take over it if you want (this PR will help me with [this issue](https://github.com/huggingface/datasets/issues/5315), not super urgent though). Okay, I propose deprecating `ignore_verifications` in favor of `verification_mode` (`load_dataset` already has `download_mode`; some other projects use this name for verification control). `verification_mode` would accept the following enum (or strings in the same manner as `download_mode` does):

```python
class VerificationMode(enum.Enum):
    FULL = "full"           # runs all verification checks 
    BASIC = "basic"     # default, runs only the cheap ones (skips the checksum check)
    NONE = "none"      # skips all the checks
```

WDTY? (copy paste from my message on slack)

What do you think of a config variable in config.py to switch from one verification mode to another ? This way we don’t deprecate anything

Many users are familiar with ignore_verifications=True, it might be overkill to deprecate it @lhoestq So we have "basic" verification mode in `config.py` and continue to have `False` as a default 
value for `ignore_verifications`? That way running all verifications including checksums would not be possible without switching the config var, right? 

I like having a `VerificationMode` enum because it's aligned with `DownloadMode` and sounds more natural to me (`ignore_verifications` feels a bit semantically reverted but this is probably just my feeling) and it's flexible (no need to worry about `config.py`, I'm not sure that users even know it exists, wdyt?).

The usage point seems also valid to me, but cases when users are stuck with NonMatchingX errors also happen from time to time and to figure out what's wrong is non-trivial here. 

As a note aside - I suggest to add instructions to the NonMatchingX error message (how to use `ignore_verifications` / `verification_mode`), this would save users who don't know about this param a lot of time. Ok I see. I'm fine with the new parameter then (even though I had a small pref for the config variable) :) I like the idea of an enum and the `verification_mode` parameter. 

In relation with the config parameter, we could additionally add a `DEFAULT_VERIFICATION_MODE`, maybe only if users require it. Note that until now there wasn't any config parameter for a default `ignore_verifications` value: I guess people are explicitly passing `ignore_verifications=True`...

As a note aside, I like the suggestion by @polinaeterna: we could give actionable messages when verifying checksums. This could be done in other PR. <details>
<summary>Show benchmarks</summary>

PyArrow==6.0.0

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.012891 / 0.011353 (0.001538) | 0.006474 / 0.011008 (-0.004535) | 0.144038 / 0.038508 (0.105530) | 0.036151 / 0.023109 (0.013042) | 0.404366 / 0.275898 (0.128468) | 0.479988 / 0.323480 (0.156508) | 0.010219 / 0.007986 (0.002233) | 0.005319 / 0.004328 (0.000990) | 0.099705 / 0.004250 (0.095455) | 0.046639 / 0.037052 (0.009586) | 0.398997 / 0.258489 (0.140508) | 0.478431 / 0.293841 (0.184590) | 0.069125 / 0.128546 (-0.059421) | 0.019603 / 0.075646 (-0.056043) | 0.400829 / 0.419271 (-0.018443) | 0.066549 / 0.043533 (0.023016) | 0.398343 / 0.255139 (0.143204) | 0.417928 / 0.283200 (0.134728) | 0.121124 / 0.141683 (-0.020559) | 1.751513 / 1.452155 (0.299358) | 1.821239 / 1.492716 (0.328523) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.251603 / 0.018006 (0.233597) | 0.579916 / 0.000490 (0.579427) | 0.003257 / 0.000200 (0.003058) | 0.000109 / 0.000054 (0.000054) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.031502 / 0.037411 (-0.005909) | 0.134688 / 0.014526 (0.120162) | 0.152306 / 0.176557 (-0.024251) | 0.198943 / 0.737135 (-0.538192) | 0.142551 / 0.296338 (-0.153788) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.634672 / 0.215209 (0.419463) | 6.370215 / 2.077655 (4.292561) | 2.548123 / 1.504120 (1.044003) | 2.184263 / 1.541195 (0.643069) | 2.239026 / 1.468490 (0.770536) | 1.233340 / 4.584777 (-3.351437) | 5.791824 / 3.745712 (2.046112) | 5.093032 / 5.269862 (-0.176830) | 2.849833 / 4.565676 (-1.715844) | 0.143787 / 0.424275 (-0.280488) | 0.015279 / 0.007607 (0.007672) | 0.757984 / 0.226044 (0.531939) | 7.883604 / 2.268929 (5.614675) | 3.321591 / 55.444624 (-52.123033) | 2.671777 / 6.876477 (-4.204700) | 2.685215 / 2.142072 (0.543142) | 1.546709 / 4.805227 (-3.258519) | 0.247186 / 6.500664 (-6.253478) | 0.085117 / 0.075469 (0.009648) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.679809 / 1.841788 (-0.161979) | 18.528893 / 8.074308 (10.454585) | 23.168590 / 10.191392 (12.977198) | 0.277618 / 0.680424 (-0.402806) | 0.045109 / 0.534201 (-0.489092) | 0.568873 / 0.579283 (-0.010410) | 0.695017 / 0.434364 (0.260653) | 0.671024 / 0.540337 (0.130687) | 0.823817 / 1.386936 (-0.563119) |

</details>
PyArrow==latest

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.009809 / 0.011353 (-0.001544) | 0.006890 / 0.011008 (-0.004118) | 0.099211 / 0.038508 (0.060703) | 0.035387 / 0.023109 (0.012278) | 0.507603 / 0.275898 (0.231705) | 0.535553 / 0.323480 (0.212073) | 0.007346 / 0.007986 (-0.000640) | 0.007559 / 0.004328 (0.003231) | 0.099132 / 0.004250 (0.094882) | 0.048048 / 0.037052 (0.010996) | 0.518096 / 0.258489 (0.259607) | 0.561134 / 0.293841 (0.267294) | 0.057580 / 0.128546 (-0.070966) | 0.023665 / 0.075646 (-0.051982) | 0.138409 / 0.419271 (-0.280862) | 0.061989 / 0.043533 (0.018456) | 0.510568 / 0.255139 (0.255429) | 0.552722 / 0.283200 (0.269522) | 0.115990 / 0.141683 (-0.025693) | 1.884900 / 1.452155 (0.432745) | 1.990604 / 1.492716 (0.497888) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.280638 / 0.018006 (0.262632) | 0.592837 / 0.000490 (0.592347) | 0.000465 / 0.000200 (0.000265) | 0.000078 / 0.000054 (0.000024) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.030253 / 0.037411 (-0.007158) | 0.141580 / 0.014526 (0.127054) | 0.135114 / 0.176557 (-0.041443) | 0.190003 / 0.737135 (-0.547133) | 0.160230 / 0.296338 (-0.136109) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.699762 / 0.215209 (0.484553) | 6.632344 / 2.077655 (4.554689) | 2.718803 / 1.504120 (1.214683) | 2.485294 / 1.541195 (0.944099) | 2.579889 / 1.468490 (1.111399) | 1.268795 / 4.584777 (-3.315982) | 5.777745 / 3.745712 (2.032033) | 3.232551 / 5.269862 (-2.037311) | 2.127699 / 4.565676 (-2.437977) | 0.146570 / 0.424275 (-0.277705) | 0.015971 / 0.007607 (0.008364) | 0.803181 / 0.226044 (0.577137) | 8.377192 / 2.268929 (6.108264) | 3.551242 / 55.444624 (-51.893382) | 2.865228 / 6.876477 (-4.011249) | 2.774869 / 2.142072 (0.632797) | 1.553856 / 4.805227 (-3.251371) | 0.264510 / 6.500664 (-6.236154) | 0.087918 / 0.075469 (0.012449) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.653396 / 1.841788 (-0.188391) | 18.703863 / 8.074308 (10.629555) | 22.067331 / 10.191392 (11.875939) | 0.257424 / 0.680424 (-0.422999) | 0.026448 / 0.534201 (-0.507753) | 0.550100 / 0.579283 (-0.029183) | 0.647296 / 0.434364 (0.212932) | 0.657476 / 0.540337 (0.117138) | 0.781119 / 1.386936 (-0.605817) |

</details>
</details>

![](https://cml.dev/watermark.png#8c4a9cb95f8742a2850f11d59abbef71d6c1f60c "CML watermark")
 <details>
<summary>Show benchmarks</summary>

PyArrow==6.0.0

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.008889 / 0.011353 (-0.002464) | 0.004563 / 0.011008 (-0.006445) | 0.101627 / 0.038508 (0.063118) | 0.030526 / 0.023109 (0.007417) | 0.297175 / 0.275898 (0.021277) | 0.368454 / 0.323480 (0.044974) | 0.007246 / 0.007986 (-0.000740) | 0.003565 / 0.004328 (-0.000763) | 0.078644 / 0.004250 (0.074394) | 0.038616 / 0.037052 (0.001564) | 0.310521 / 0.258489 (0.052032) | 0.348014 / 0.293841 (0.054173) | 0.033463 / 0.128546 (-0.095083) | 0.011544 / 0.075646 (-0.064102) | 0.323281 / 0.419271 (-0.095990) | 0.040187 / 0.043533 (-0.003346) | 0.298015 / 0.255139 (0.042876) | 0.326392 / 0.283200 (0.043193) | 0.088730 / 0.141683 (-0.052952) | 1.503387 / 1.452155 (0.051233) | 1.548704 / 1.492716 (0.055988) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.185983 / 0.018006 (0.167977) | 0.451889 / 0.000490 (0.451400) | 0.001433 / 0.000200 (0.001233) | 0.000080 / 0.000054 (0.000026) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.023396 / 0.037411 (-0.014015) | 0.118236 / 0.014526 (0.103710) | 0.124594 / 0.176557 (-0.051962) | 0.159089 / 0.737135 (-0.578047) | 0.129369 / 0.296338 (-0.166969) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.423161 / 0.215209 (0.207952) | 4.228211 / 2.077655 (2.150556) | 1.853862 / 1.504120 (0.349742) | 1.649471 / 1.541195 (0.108276) | 1.708631 / 1.468490 (0.240141) | 0.697456 / 4.584777 (-3.887321) | 3.473244 / 3.745712 (-0.272468) | 1.942586 / 5.269862 (-3.327275) | 1.291592 / 4.565676 (-3.274084) | 0.082758 / 0.424275 (-0.341517) | 0.012256 / 0.007607 (0.004649) | 0.528355 / 0.226044 (0.302311) | 5.277620 / 2.268929 (3.008691) | 2.299604 / 55.444624 (-53.145020) | 1.954940 / 6.876477 (-4.921537) | 2.055543 / 2.142072 (-0.086529) | 0.814723 / 4.805227 (-3.990505) | 0.149937 / 6.500664 (-6.350727) | 0.064529 / 0.075469 (-0.010941) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.266240 / 1.841788 (-0.575547) | 14.144016 / 8.074308 (6.069708) | 14.331733 / 10.191392 (4.140340) | 0.138963 / 0.680424 (-0.541461) | 0.029034 / 0.534201 (-0.505167) | 0.397325 / 0.579283 (-0.181958) | 0.405293 / 0.434364 (-0.029071) | 0.480745 / 0.540337 (-0.059592) | 0.573386 / 1.386936 (-0.813550) |

</details>
PyArrow==latest

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.007214 / 0.011353 (-0.004139) | 0.004569 / 0.011008 (-0.006439) | 0.078718 / 0.038508 (0.040209) | 0.031104 / 0.023109 (0.007995) | 0.342562 / 0.275898 (0.066664) | 0.387802 / 0.323480 (0.064322) | 0.005378 / 0.007986 (-0.002608) | 0.003414 / 0.004328 (-0.000915) | 0.077249 / 0.004250 (0.072999) | 0.044337 / 0.037052 (0.007285) | 0.341397 / 0.258489 (0.082907) | 0.385536 / 0.293841 (0.091695) | 0.033257 / 0.128546 (-0.095289) | 0.011825 / 0.075646 (-0.063821) | 0.086723 / 0.419271 (-0.332549) | 0.045951 / 0.043533 (0.002418) | 0.340914 / 0.255139 (0.085775) | 0.367126 / 0.283200 (0.083926) | 0.096326 / 0.141683 (-0.045357) | 1.608612 / 1.452155 (0.156458) | 1.687251 / 1.492716 (0.194534) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.227595 / 0.018006 (0.209589) | 0.418502 / 0.000490 (0.418013) | 0.000392 / 0.000200 (0.000192) | 0.000059 / 0.000054 (0.000005) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.026232 / 0.037411 (-0.011179) | 0.101020 / 0.014526 (0.086494) | 0.110017 / 0.176557 (-0.066539) | 0.153497 / 0.737135 (-0.583639) | 0.110602 / 0.296338 (-0.185737) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.433789 / 0.215209 (0.218579) | 4.329350 / 2.077655 (2.251696) | 2.052136 / 1.504120 (0.548016) | 1.848457 / 1.541195 (0.307262) | 1.936791 / 1.468490 (0.468301) | 0.700609 / 4.584777 (-3.884168) | 3.391983 / 3.745712 (-0.353729) | 1.903220 / 5.269862 (-3.366642) | 1.179463 / 4.565676 (-3.386213) | 0.084025 / 0.424275 (-0.340250) | 0.012743 / 0.007607 (0.005136) | 0.536816 / 0.226044 (0.310772) | 5.420230 / 2.268929 (3.151302) | 2.507438 / 55.444624 (-52.937187) | 2.178907 / 6.876477 (-4.697570) | 2.228586 / 2.142072 (0.086514) | 0.812527 / 4.805227 (-3.992701) | 0.153382 / 6.500664 (-6.347282) | 0.069932 / 0.075469 (-0.005537) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.256861 / 1.841788 (-0.584927) | 14.309236 / 8.074308 (6.234928) | 13.740323 / 10.191392 (3.548931) | 0.142698 / 0.680424 (-0.537726) | 0.016998 / 0.534201 (-0.517203) | 0.385489 / 0.579283 (-0.193794) | 0.391515 / 0.434364 (-0.042849) | 0.472704 / 0.540337 (-0.067633) | 0.565042 / 1.386936 (-0.821894) |

</details>
</details>

![](https://cml.dev/watermark.png#4b0713ddf2e2e7129d9ccda791d265684c96675c "CML watermark")
 This is ready for review. 

If `verification_mode` is None, it defaults to `VerificationMode.BASIC` instead of `VerificationMode.NONE`, so maybe we should find a better name for the latter to avoid confusion.

PS: `ignore_verifications` is still present in the `test`/`run_beam` commands for simplicity. Let me know if you think these commands should support all three modes. > I would also prefer to change the name for the NONE verification mode, but don't have really good ideas in mind. maybe smth like SKIP_ALL ?

I decided to go with the following names:
* `no_checks` (previously `none`)
* `basic_checks` (previously `basic`)
* `all_checks` (previously `full`)
 <details>
<summary>Show benchmarks</summary>

PyArrow==6.0.0

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.008900 / 0.011353 (-0.002453) | 0.004492 / 0.011008 (-0.006516) | 0.100957 / 0.038508 (0.062449) | 0.030145 / 0.023109 (0.007036) | 0.302531 / 0.275898 (0.026633) | 0.344072 / 0.323480 (0.020592) | 0.007032 / 0.007986 (-0.000953) | 0.004150 / 0.004328 (-0.000178) | 0.078272 / 0.004250 (0.074021) | 0.034142 / 0.037052 (-0.002910) | 0.310798 / 0.258489 (0.052308) | 0.350077 / 0.293841 (0.056236) | 0.034497 / 0.128546 (-0.094050) | 0.011417 / 0.075646 (-0.064230) | 0.323427 / 0.419271 (-0.095844) | 0.045664 / 0.043533 (0.002132) | 0.304688 / 0.255139 (0.049549) | 0.336591 / 0.283200 (0.053391) | 0.086116 / 0.141683 (-0.055567) | 1.519278 / 1.452155 (0.067123) | 1.576728 / 1.492716 (0.084011) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.242482 / 0.018006 (0.224476) | 0.403548 / 0.000490 (0.403058) | 0.001217 / 0.000200 (0.001017) | 0.000073 / 0.000054 (0.000018) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.023466 / 0.037411 (-0.013945) | 0.095220 / 0.014526 (0.080694) | 0.104119 / 0.176557 (-0.072438) | 0.141107 / 0.737135 (-0.596029) | 0.107236 / 0.296338 (-0.189102) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.416290 / 0.215209 (0.201081) | 4.159068 / 2.077655 (2.081413) | 1.846014 / 1.504120 (0.341894) | 1.634789 / 1.541195 (0.093594) | 1.724687 / 1.468490 (0.256196) | 0.696887 / 4.584777 (-3.887890) | 3.313861 / 3.745712 (-0.431851) | 1.907239 / 5.269862 (-3.362622) | 1.266815 / 4.565676 (-3.298861) | 0.081660 / 0.424275 (-0.342615) | 0.012290 / 0.007607 (0.004683) | 0.522866 / 0.226044 (0.296822) | 5.237356 / 2.268929 (2.968428) | 2.294645 / 55.444624 (-53.149979) | 1.946407 / 6.876477 (-4.930069) | 1.995441 / 2.142072 (-0.146632) | 0.808340 / 4.805227 (-3.996887) | 0.149670 / 6.500664 (-6.350994) | 0.065162 / 0.075469 (-0.010307) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.219476 / 1.841788 (-0.622312) | 13.868709 / 8.074308 (5.794401) | 14.115783 / 10.191392 (3.924391) | 0.149403 / 0.680424 (-0.531021) | 0.028514 / 0.534201 (-0.505686) | 0.398194 / 0.579283 (-0.181089) | 0.410898 / 0.434364 (-0.023466) | 0.485763 / 0.540337 (-0.054574) | 0.574924 / 1.386936 (-0.812012) |

</details>
PyArrow==latest

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.006906 / 0.011353 (-0.004447) | 0.004446 / 0.011008 (-0.006562) | 0.075936 / 0.038508 (0.037428) | 0.027693 / 0.023109 (0.004584) | 0.339505 / 0.275898 (0.063607) | 0.383315 / 0.323480 (0.059835) | 0.005138 / 0.007986 (-0.002847) | 0.004636 / 0.004328 (0.000308) | 0.074829 / 0.004250 (0.070578) | 0.040327 / 0.037052 (0.003274) | 0.340516 / 0.258489 (0.082027) | 0.388569 / 0.293841 (0.094729) | 0.031562 / 0.128546 (-0.096984) | 0.011585 / 0.075646 (-0.064061) | 0.084753 / 0.419271 (-0.334518) | 0.041310 / 0.043533 (-0.002223) | 0.338272 / 0.255139 (0.083133) | 0.367243 / 0.283200 (0.084043) | 0.092653 / 0.141683 (-0.049029) | 1.515973 / 1.452155 (0.063818) | 1.582869 / 1.492716 (0.090152) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.229366 / 0.018006 (0.211360) | 0.414404 / 0.000490 (0.413914) | 0.002922 / 0.000200 (0.002723) | 0.000075 / 0.000054 (0.000020) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.026391 / 0.037411 (-0.011020) | 0.106754 / 0.014526 (0.092228) | 0.110718 / 0.176557 (-0.065839) | 0.145786 / 0.737135 (-0.591350) | 0.113180 / 0.296338 (-0.183159) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.446340 / 0.215209 (0.231131) | 4.499756 / 2.077655 (2.422101) | 2.071485 / 1.504120 (0.567365) | 1.873223 / 1.541195 (0.332029) | 1.931562 / 1.468490 (0.463071) | 0.699270 / 4.584777 (-3.885507) | 3.452383 / 3.745712 (-0.293329) | 2.970630 / 5.269862 (-2.299232) | 1.300859 / 4.565676 (-3.264817) | 0.083971 / 0.424275 (-0.340304) | 0.012489 / 0.007607 (0.004882) | 0.544190 / 0.226044 (0.318146) | 5.460097 / 2.268929 (3.191169) | 2.700244 / 55.444624 (-52.744380) | 2.396694 / 6.876477 (-4.479783) | 2.376334 / 2.142072 (0.234262) | 0.812845 / 4.805227 (-3.992382) | 0.154441 / 6.500664 (-6.346223) | 0.069510 / 0.075469 (-0.005959) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.278836 / 1.841788 (-0.562952) | 14.153158 / 8.074308 (6.078850) | 13.821290 / 10.191392 (3.629898) | 0.160464 / 0.680424 (-0.519960) | 0.016742 / 0.534201 (-0.517459) | 0.379840 / 0.579283 (-0.199443) | 0.391903 / 0.434364 (-0.042461) | 0.461646 / 0.540337 (-0.078691) | 0.550691 / 1.386936 (-0.836245) |

</details>
</details>

![](https://cml.dev/watermark.png#aeb637daab938d51b8b15ad4d175d06817e99512 "CML watermark")
 <details>
<summary>Show benchmarks</summary>

PyArrow==6.0.0

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.009858 / 0.011353 (-0.001495) | 0.005383 / 0.011008 (-0.005625) | 0.100527 / 0.038508 (0.062019) | 0.037176 / 0.023109 (0.014067) | 0.295204 / 0.275898 (0.019306) | 0.364511 / 0.323480 (0.041031) | 0.008486 / 0.007986 (0.000500) | 0.004273 / 0.004328 (-0.000055) | 0.076538 / 0.004250 (0.072288) | 0.046250 / 0.037052 (0.009197) | 0.307102 / 0.258489 (0.048613) | 0.339313 / 0.293841 (0.045472) | 0.040783 / 0.128546 (-0.087763) | 0.012323 / 0.075646 (-0.063323) | 0.336216 / 0.419271 (-0.083055) | 0.050480 / 0.043533 (0.006947) | 0.293689 / 0.255139 (0.038550) | 0.315034 / 0.283200 (0.031834) | 0.113775 / 0.141683 (-0.027908) | 1.438738 / 1.452155 (-0.013416) | 1.499874 / 1.492716 (0.007157) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.202392 / 0.018006 (0.184386) | 0.442784 / 0.000490 (0.442295) | 0.003004 / 0.000200 (0.002804) | 0.000087 / 0.000054 (0.000033) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.027792 / 0.037411 (-0.009620) | 0.110886 / 0.014526 (0.096360) | 0.121041 / 0.176557 (-0.055515) | 0.166803 / 0.737135 (-0.570333) | 0.127617 / 0.296338 (-0.168722) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.409762 / 0.215209 (0.194553) | 4.073297 / 2.077655 (1.995643) | 1.836375 / 1.504120 (0.332255) | 1.651507 / 1.541195 (0.110312) | 1.734134 / 1.468490 (0.265644) | 0.690900 / 4.584777 (-3.893877) | 3.812045 / 3.745712 (0.066333) | 2.101378 / 5.269862 (-3.168483) | 1.438242 / 4.565676 (-3.127434) | 0.083256 / 0.424275 (-0.341020) | 0.012436 / 0.007607 (0.004829) | 0.501702 / 0.226044 (0.275658) | 5.007679 / 2.268929 (2.738751) | 2.315158 / 55.444624 (-53.129466) | 2.003934 / 6.876477 (-4.872543) | 2.154658 / 2.142072 (0.012586) | 0.831749 / 4.805227 (-3.973478) | 0.165058 / 6.500664 (-6.335606) | 0.062166 / 0.075469 (-0.013303) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.212435 / 1.841788 (-0.629353) | 15.022673 / 8.074308 (6.948365) | 14.649631 / 10.191392 (4.458239) | 0.172121 / 0.680424 (-0.508303) | 0.028791 / 0.534201 (-0.505410) | 0.440290 / 0.579283 (-0.138993) | 0.437359 / 0.434364 (0.002995) | 0.543603 / 0.540337 (0.003265) | 0.643241 / 1.386936 (-0.743695) |

</details>
PyArrow==latest

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.007572 / 0.011353 (-0.003781) | 0.005207 / 0.011008 (-0.005801) | 0.074427 / 0.038508 (0.035919) | 0.033384 / 0.023109 (0.010275) | 0.334538 / 0.275898 (0.058640) | 0.371556 / 0.323480 (0.048076) | 0.006453 / 0.007986 (-0.001532) | 0.004010 / 0.004328 (-0.000319) | 0.073488 / 0.004250 (0.069238) | 0.048082 / 0.037052 (0.011030) | 0.337325 / 0.258489 (0.078836) | 0.395143 / 0.293841 (0.101302) | 0.036714 / 0.128546 (-0.091832) | 0.012089 / 0.075646 (-0.063557) | 0.086008 / 0.419271 (-0.333263) | 0.049277 / 0.043533 (0.005744) | 0.333848 / 0.255139 (0.078709) | 0.354003 / 0.283200 (0.070803) | 0.105012 / 0.141683 (-0.036671) | 1.450769 / 1.452155 (-0.001386) | 1.554538 / 1.492716 (0.061821) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.208407 / 0.018006 (0.190400) | 0.438778 / 0.000490 (0.438288) | 0.000399 / 0.000200 (0.000199) | 0.000059 / 0.000054 (0.000005) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.030180 / 0.037411 (-0.007232) | 0.115432 / 0.014526 (0.100906) | 0.126106 / 0.176557 (-0.050451) | 0.167508 / 0.737135 (-0.569627) | 0.130566 / 0.296338 (-0.165772) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.421408 / 0.215209 (0.206198) | 4.208492 / 2.077655 (2.130838) | 2.024177 / 1.504120 (0.520057) | 1.834356 / 1.541195 (0.293161) | 1.923234 / 1.468490 (0.454744) | 0.699548 / 4.584777 (-3.885229) | 3.933775 / 3.745712 (0.188063) | 2.124526 / 5.269862 (-3.145336) | 1.360934 / 4.565676 (-3.204742) | 0.086568 / 0.424275 (-0.337707) | 0.012351 / 0.007607 (0.004744) | 0.517431 / 0.226044 (0.291387) | 5.175428 / 2.268929 (2.906499) | 2.471031 / 55.444624 (-52.973593) | 2.131529 / 6.876477 (-4.744948) | 2.202512 / 2.142072 (0.060440) | 0.849364 / 4.805227 (-3.955863) | 0.171505 / 6.500664 (-6.329159) | 0.065864 / 0.075469 (-0.009605) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.270054 / 1.841788 (-0.571734) | 15.254502 / 8.074308 (7.180194) | 13.874969 / 10.191392 (3.683577) | 0.144131 / 0.680424 (-0.536293) | 0.017743 / 0.534201 (-0.516458) | 0.421990 / 0.579283 (-0.157293) | 0.423924 / 0.434364 (-0.010439) | 0.522560 / 0.540337 (-0.017778) | 0.626159 / 1.386936 (-0.760777) |

</details>
</details>

![](https://cml.dev/watermark.png#05bd726a575a3c1c337022424fa7d226f1a2ebee "CML watermark")
 <details>
<summary>Show benchmarks</summary>

PyArrow==6.0.0

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.008643 / 0.011353 (-0.002710) | 0.004479 / 0.011008 (-0.006529) | 0.102372 / 0.038508 (0.063864) | 0.029703 / 0.023109 (0.006594) | 0.301479 / 0.275898 (0.025581) | 0.370970 / 0.323480 (0.047490) | 0.007044 / 0.007986 (-0.000942) | 0.004868 / 0.004328 (0.000540) | 0.079568 / 0.004250 (0.075318) | 0.035344 / 0.037052 (-0.001708) | 0.308091 / 0.258489 (0.049602) | 0.353812 / 0.293841 (0.059971) | 0.033406 / 0.128546 (-0.095140) | 0.011476 / 0.075646 (-0.064170) | 0.324343 / 0.419271 (-0.094929) | 0.040293 / 0.043533 (-0.003240) | 0.300007 / 0.255139 (0.044868) | 0.334410 / 0.283200 (0.051210) | 0.086553 / 0.141683 (-0.055130) | 1.463814 / 1.452155 (0.011659) | 1.501580 / 1.492716 (0.008864) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.198032 / 0.018006 (0.180025) | 0.409970 / 0.000490 (0.409480) | 0.001075 / 0.000200 (0.000875) | 0.000076 / 0.000054 (0.000022) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.022941 / 0.037411 (-0.014471) | 0.097320 / 0.014526 (0.082794) | 0.106445 / 0.176557 (-0.070111) | 0.139073 / 0.737135 (-0.598063) | 0.108408 / 0.296338 (-0.187930) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.419315 / 0.215209 (0.204106) | 4.199273 / 2.077655 (2.121618) | 1.877689 / 1.504120 (0.373569) | 1.670442 / 1.541195 (0.129247) | 1.735034 / 1.468490 (0.266544) | 0.694691 / 4.584777 (-3.890086) | 3.323644 / 3.745712 (-0.422069) | 2.884349 / 5.269862 (-2.385513) | 1.518882 / 4.565676 (-3.046794) | 0.082390 / 0.424275 (-0.341886) | 0.012884 / 0.007607 (0.005277) | 0.525103 / 0.226044 (0.299058) | 5.277297 / 2.268929 (3.008369) | 2.328639 / 55.444624 (-53.115985) | 1.983210 / 6.876477 (-4.893267) | 2.037985 / 2.142072 (-0.104088) | 0.809520 / 4.805227 (-3.995707) | 0.150150 / 6.500664 (-6.350514) | 0.065578 / 0.075469 (-0.009891) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.221971 / 1.841788 (-0.619817) | 13.692361 / 8.074308 (5.618052) | 13.874582 / 10.191392 (3.683190) | 0.138182 / 0.680424 (-0.542242) | 0.028618 / 0.534201 (-0.505583) | 0.395104 / 0.579283 (-0.184179) | 0.397169 / 0.434364 (-0.037195) | 0.457509 / 0.540337 (-0.082829) | 0.537275 / 1.386936 (-0.849661) |

</details>
PyArrow==latest

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.006835 / 0.011353 (-0.004518) | 0.004585 / 0.011008 (-0.006423) | 0.076877 / 0.038508 (0.038369) | 0.027305 / 0.023109 (0.004196) | 0.349085 / 0.275898 (0.073187) | 0.401416 / 0.323480 (0.077936) | 0.004912 / 0.007986 (-0.003074) | 0.003315 / 0.004328 (-0.001014) | 0.075676 / 0.004250 (0.071425) | 0.038960 / 0.037052 (0.001907) | 0.346196 / 0.258489 (0.087707) | 0.403185 / 0.293841 (0.109344) | 0.032054 / 0.128546 (-0.096493) | 0.011742 / 0.075646 (-0.063905) | 0.086631 / 0.419271 (-0.332640) | 0.041633 / 0.043533 (-0.001900) | 0.343519 / 0.255139 (0.088380) | 0.385413 / 0.283200 (0.102213) | 0.091430 / 0.141683 (-0.050253) | 1.478886 / 1.452155 (0.026731) | 1.546873 / 1.492716 (0.054156) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.167882 / 0.018006 (0.149876) | 0.396464 / 0.000490 (0.395974) | 0.003629 / 0.000200 (0.003429) | 0.000085 / 0.000054 (0.000030) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.024829 / 0.037411 (-0.012583) | 0.099607 / 0.014526 (0.085081) | 0.106187 / 0.176557 (-0.070370) | 0.142379 / 0.737135 (-0.594756) | 0.109307 / 0.296338 (-0.187032) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.442276 / 0.215209 (0.227067) | 4.427099 / 2.077655 (2.349444) | 2.093407 / 1.504120 (0.589287) | 1.880973 / 1.541195 (0.339778) | 1.915592 / 1.468490 (0.447102) | 0.708196 / 4.584777 (-3.876581) | 3.417649 / 3.745712 (-0.328063) | 2.859953 / 5.269862 (-2.409909) | 1.528380 / 4.565676 (-3.037297) | 0.084054 / 0.424275 (-0.340221) | 0.012585 / 0.007607 (0.004978) | 0.537614 / 0.226044 (0.311569) | 5.409915 / 2.268929 (3.140987) | 2.555853 / 55.444624 (-52.888771) | 2.195075 / 6.876477 (-4.681402) | 2.232775 / 2.142072 (0.090703) | 0.814994 / 4.805227 (-3.990233) | 0.152882 / 6.500664 (-6.347782) | 0.067467 / 0.075469 (-0.008002) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.306007 / 1.841788 (-0.535780) | 13.923981 / 8.074308 (5.849673) | 13.385881 / 10.191392 (3.194489) | 0.150712 / 0.680424 (-0.529712) | 0.016731 / 0.534201 (-0.517470) | 0.376557 / 0.579283 (-0.202726) | 0.379396 / 0.434364 (-0.054968) | 0.456251 / 0.540337 (-0.084087) | 0.545731 / 1.386936 (-0.841205) |

</details>
</details>

![](https://cml.dev/watermark.png#cc637d107ef3e3b9948691379312a8099b6476aa "CML watermark")

Skip the dataset verifications (split and checksum verifications, duplicate keys check) by default unless a dataset is being tested (`datasets-cli test/run_beam`). The main goal is to avoid running the checksum check in the default case due to how expensive it can be for large datasets.

PS: Maybe we should deprecate `ignore_verifications`, which is `True` now by default, and give it a different name?