wandb logging does not work - log method called on the wrong object (?)
🐛 Bug
When using the WandbLogger and not providing an experiment, I get an AttributeError: 'Run' object has no attribute 'log' in line 84 of WandbLogger. Instead on experiment, I think log should be called on wandb
Code sample
wandb_logger = WandbLogger(name="name", save_dir="/path/to/folder", offline=False,  project="project")
trainer = Trainer(logger=wandb_logger)
trainer.fit(model)

Environment

PyTorch Version (e.g., 1.0): 1.2
OS (e.g., Linux): Ubuntu 18.04
How you installed PyTorch (conda, pip, source): pip
Build command you used (if compiling from source):
Python version: 3.7
CUDA/cuDNN version:9.0
GPU models and configuration:
Any other relevant information: