Add fast.ai integration

[Khazhak]

Closes #462.

[gorarakelyan]

Let's add training code example for fast.ai as well, inside examples directory.

[gorarakelyan]

@Khazhak I get this error when running fastai_track.py

 Traceback (most recent call last):
  File "fastai_track.py", line 31, in <module>
    dls = arab_mnist.dataloaders('.')
  File "/Users/gor/Projects/aim/test-envs/fastai/venv/lib/python3.6/site-packages/fastai/data/block.py", line 113, in dataloaders
    dsets = self.datasets(source, verbose=verbose)
  File "/Users/gor/Projects/aim/test-envs/fastai/venv/lib/python3.6/site-packages/fastai/data/block.py", line 110, in datasets
    return Datasets(items, tfms=self._combine_type_tfms(), splits=splits, dl_type=self.dl_type, n_inp=self.n_inp, verbose=verbose)
  File "/Users/gor/Projects/aim/test-envs/fastai/venv/lib/python3.6/site-packages/fastai/data/core.py", line 329, in __init__
    self.tls = L(tls if tls else [TfmdLists(items, t, **kwargs) for t in L(ifnone(tfms,[None]))])
  File "/Users/gor/Projects/aim/test-envs/fastai/venv/lib/python3.6/site-packages/fastai/data/core.py", line 329, in <listcomp>
    self.tls = L(tls if tls else [TfmdLists(items, t, **kwargs) for t in L(ifnone(tfms,[None]))])
  File "/Users/gor/Projects/aim/test-envs/fastai/venv/lib/python3.6/site-packages/fastcore/foundation.py", line 97, in __call__
    return super().__call__(x, *args, **kwargs)
  File "/Users/gor/Projects/aim/test-envs/fastai/venv/lib/python3.6/site-packages/fastai/data/core.py", line 255, in __init__
    self.setup(train_setup=train_setup)
  File "/Users/gor/Projects/aim/test-envs/fastai/venv/lib/python3.6/site-packages/fastai/data/core.py", line 273, in setup
    x = super().__getitem__(0) if self.splits is None else super().__getitem__(self.splits[0])[0]
  File "/Users/gor/Projects/aim/test-envs/fastai/venv/lib/python3.6/site-packages/fastcore/foundation.py", line 111, in __getitem__
    def __getitem__(self, idx): return self._get(idx) if is_indexer(idx) else L(self._get(idx), use_list=None)
  File "/Users/gor/Projects/aim/test-envs/fastai/venv/lib/python3.6/site-packages/fastcore/foundation.py", line 115, in _get
    if is_indexer(i) or isinstance(i,slice): return getattr(self.items,'iloc',self.items)[i]
IndexError: list index out of range

[Khazhak]

Taking a look.

[gorarakelyan]

Python 3.6.5

fastai==2.3.1 torch==1.8.1 torchtext==0.6.0 torchvision==0.9.1

[gorarakelyan]

@Khazhak Let's format trainer configs with _format_config function and pass to the aim session

# Cell
def _format_config_value(v):
    if isinstance(v, list):
        return [_format_config_value(item) for item in v]
    elif hasattr(v, '__stored_args__'):
        return {**_format_config(v.__stored_args__), '_name': v}
    return v

# Cell
def _format_config(config):
    "Format config parameters before logging them"
    for k,v in config.items():
        if isinstance(v, dict):
            config[k] = _format_config(v)
        else:
            config[k] = _format_config_value(v)
    return config

[karan2801]

@gorarakelyan Could you please assign me this issue if no one else is working on it?

[gorarakelyan]

@karan2801 done ✅

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:x: Khazhak

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[gorarakelyan]

closing this PR. The further development moved here #2123