ruby : fix test failures in test_whisper (#2955)

* bindings.ruby : fix test failures in test_whisper

This commit updates the parallel tests to use 2 processors instead of
the number of processors on the system. It also comments out the setting
of the log callback to an empty lambda as this causes a segfault when
enabled.

The motivation for the change to the number of processors is that if one
has a large number of processors, for example I have 16 on the machine I
used to test this, this would cause the following warning to be printed:
```console
whisper_full_with_state: input is too short - 680 ms < 1000 ms. consider padding the input audio with silence
```

This is logged from:
```c++
int whisper_full_with_state(
struct whisper_context * ctx,
struct whisper_state * state,
struct whisper_full_params params,
const float * samples,
int n_samples) {
...
if (seek_end < seek_start + 100) {
WHISPER_LOG_WARN("%s: input is too short - %d ms < 1000 ms. consider padding the input audio with silence\n", __func__, (seek_end - seek_start)*10);
return 0;
}
```
This will return early and there will be segment callbacks to be invoked
which in turn will cause the tests to fail.

* bindings.ruby : fix warnings in tests

This commit fixes the following warnings in the Ruby tests:
```console
/whisper/bindings/ruby/tests/test_segment.rb:52:
warning: ambiguity between regexp and two divisions:
wrap regexp in parentheses or add a space after `/' operator
```
And also adds a '_' prefix to some unused variables to avoid warnings.

* bindings.ruby : enable Wisper.log_set in tests

The commit reverts the commenting out of the Whisper.log_set call in
the test_whisper.rb tests.

I'm no longer getting segfaults when running the tests with this
which was the case earlier. One theory could be that I rebased this to
include the latest ggml sync to master to make sure things still worked.
With the latest changes in ggml, I can't reproduce the segfaults.

bindings/ruby/tests/test_callback.rb

@@ -25,7 +25,7 @@ class TestCallback < TestBase
         assert start_time >= 0
         assert_kind_of Integer, end_time
         assert end_time > 0
-        assert_match /ask not what your country can do for you, ask what you can do for your country/, text if i_segment == 0
+        assert_match(/ask not what your country can do for you, ask what you can do for your country/, text) if i_segment == 0
       end
     }
 
@@ -145,9 +145,9 @@ class TestCallback < TestBase
 
   def test_abort_on
     do_abort = false
-    aborted_from_callback = false
+    _aborted_from_callback = false
     @params.on_new_segment do |segment|
-      do_abort = true if segment.text.match? /ask/
+      do_abort = true if segment.text.match?(/ask/)
     end
     i = 0
     @params.abort_on do

bindings/ruby/tests/test_error.rb

@@ -4,7 +4,7 @@ class TestError < TestBase
   def test_error
     error = Whisper::Error.new(-2)
     assert_equal "failed to compute log mel spectrogram", error.message
-    assert_equal -2, error.code
+    assert_equal(-2, error.code)
   end
 
   def test_unknown_error
@@ -14,7 +14,7 @@ class TestError < TestBase
 
   def test_non_int_code
     assert_raise TypeError do
-      error = Whisper::Error.new("non int")
+      _error = Whisper::Error.new("non int")
     end
   end
 end

bindings/ruby/tests/test_params.rb

@@ -162,7 +162,7 @@ class TestParams < TestBase
   end
 
   def test_length_penalty
-    assert_equal -1.0, @params.length_penalty
+    assert_equal(-1.0, @params.length_penalty)
     @params.length_penalty = 0.5
     assert_equal 0.5, @params.length_penalty
   end
@@ -180,9 +180,9 @@ class TestParams < TestBase
   end
 
   def test_logprob_thold
-    assert_in_delta -1.0, @params.logprob_thold
+    assert_in_delta(-1.0, @params.logprob_thold)
     @params.logprob_thold = -0.5
-    assert_in_delta -0.5, @params.logprob_thold
+    assert_in_delta(-0.5, @params.logprob_thold)
   end
 
   def test_no_speech_thold

bindings/ruby/tests/test_segment.rb

@@ -49,13 +49,13 @@ class TestSegment < TestBase
       if index == 0
         seg = segment
         assert_equal 0, segment.start_time
-        assert_match /ask not what your country can do for you, ask what you can do for your country/, segment.text
+        assert_match(/ask not what your country can do for you, ask what you can do for your country/, segment.text)
       end
       index += 1
     end
     whisper.transcribe(AUDIO, params)
     assert_equal 0, seg.start_time
-    assert_match /ask not what your country can do for you, ask what you can do for your country/, seg.text
+    assert_match(/ask not what your country can do for you, ask what you can do for your country/, seg.text)
   end
 
   def test_on_new_segment_twice

bindings/ruby/tests/test_whisper.rb

@@ -16,7 +16,7 @@ class TestWhisper < TestBase
     params.print_timestamps = false
 
     @whisper.transcribe(AUDIO, params) {|text|
-      assert_match /ask not what your country can do for you, ask what you can do for your country/, text
+      assert_match(/ask not what your country can do for you, ask what you can do for your country/, text)
     }
   end
 
@@ -32,7 +32,7 @@ class TestWhisper < TestBase
     def test_full_get_segment
       segment = whisper.full_get_segment(0)
       assert_equal 0, segment.start_time
-      assert_match /ask not what your country can do for you, ask what you can do for your country/, segment.text
+      assert_match(/ask not what your country can do for you, ask what you can do for your country/, segment.text)
     end
 
     def test_full_get_segment_t0
@@ -59,7 +59,7 @@ class TestWhisper < TestBase
     end
 
     def test_full_get_segment_text
-      assert_match /ask not what your country can do for you, ask what you can do for your country/, whisper.full_get_segment_text(0)
+      assert_match(/ask not what your country can do for you, ask what you can do for your country/, whisper.full_get_segment_text(0))
     end
 
     def test_full_get_segment_no_speech_prob
@@ -134,14 +134,14 @@ class TestWhisper < TestBase
       @whisper.full(@params, @samples, @samples.length)
 
       assert_equal 1, @whisper.full_n_segments
-      assert_match /ask not what your country can do for you, ask what you can do for your country/, @whisper.each_segment.first.text
+      assert_match(/ask not what your country can do for you, ask what you can do for your country/, @whisper.each_segment.first.text)
     end
 
     def test_full_without_length
       @whisper.full(@params, @samples)
 
       assert_equal 1, @whisper.full_n_segments
-      assert_match /ask not what your country can do for you, ask what you can do for your country/, @whisper.each_segment.first.text
+      assert_match(/ask not what your country can do for you, ask what you can do for your country/, @whisper.each_segment.first.text)
     end
 
     def test_full_enumerator
@@ -149,7 +149,7 @@ class TestWhisper < TestBase
       @whisper.full(@params, samples, @samples.length)
 
       assert_equal 1, @whisper.full_n_segments
-      assert_match /ask not what your country can do for you, ask what you can do for your country/, @whisper.each_segment.first.text
+      assert_match(/ask not what your country can do for you, ask what you can do for your country/, @whisper.each_segment.first.text)
     end
 
     def test_full_enumerator_without_length
@@ -171,26 +171,28 @@ class TestWhisper < TestBase
       @whisper.full(@params, samples)
 
       assert_equal 1, @whisper.full_n_segments
-      assert_match /ask not what your country can do for you, ask what you can do for your country/, @whisper.each_segment.first.text
+      assert_match(/ask not what your country can do for you, ask what you can do for your country/, @whisper.each_segment.first.text)
     end
 
     def test_full_parallel
-      @whisper.full_parallel(@params, @samples, @samples.length, Etc.nprocessors)
+      nprocessors = 2
+      @whisper.full_parallel(@params, @samples, @samples.length, nprocessors)
 
-      assert_equal Etc.nprocessors, @whisper.full_n_segments
+      assert_equal nprocessors, @whisper.full_n_segments
       text = @whisper.each_segment.collect(&:text).join
-      assert_match /ask what you can do/i, text
-      assert_match /for your country/i, text
+      assert_match(/ask what you can do/i, text)
+      assert_match(/for your country/i, text)
     end
 
     def test_full_parallel_with_memory_view
+      nprocessors = 2
       samples = JFKReader.new(AUDIO)
-      @whisper.full_parallel(@params, samples, nil, Etc.nprocessors)
+      @whisper.full_parallel(@params, samples, nil, nprocessors)
 
-      assert_equal Etc.nprocessors, @whisper.full_n_segments
+      assert_equal nprocessors, @whisper.full_n_segments
       text = @whisper.each_segment.collect(&:text).join
-      assert_match /ask what you can do/i, text
-      assert_match /for your country/i, text
+      assert_match(/ask what you can do/i, text)
+      assert_match(/for your country/i, text)
     end
 
     def test_full_parallel_without_length_and_n_processors
@@ -198,17 +200,18 @@ class TestWhisper < TestBase
 
       assert_equal 1, @whisper.full_n_segments
       text = @whisper.each_segment.collect(&:text).join
-      assert_match /ask what you can do/i, text
-      assert_match /for your country/i, text
+      assert_match(/ask what you can do/i, text)
+      assert_match(/for your country/i, text)
     end
 
     def test_full_parallel_without_length
-      @whisper.full_parallel(@params, @samples, nil, Etc.nprocessors)
+      nprocessors = 2
+      @whisper.full_parallel(@params, @samples, nil, nprocessors)
 
-      assert_equal Etc.nprocessors, @whisper.full_n_segments
+      assert_equal nprocessors, @whisper.full_n_segments
       text = @whisper.each_segment.collect(&:text).join
-      assert_match /ask what you can do/i, text
-      assert_match /for your country/i, text
+      assert_match(/ask what you can do/i, text)
+      assert_match(/for your country/i, text)
     end
 
     def test_full_parallel_without_n_processors
@@ -216,8 +219,8 @@ class TestWhisper < TestBase
 
       assert_equal 1, @whisper.full_n_segments
       text = @whisper.each_segment.collect(&:text).join
-      assert_match /ask what you can do/i, text
-      assert_match /for your country/i, text
+      assert_match(/ask what you can do/i, text)
+      assert_match(/for your country/i, text)
     end
   end
 end