Summary:
X-link: pytorch/pytorch#80232

Pull Request resolved: meta-pytorch#547

Fixes meta-pytorch#538
- Improve the validation function to raise warning about unpickable function when either lambda or local function is provided to DataPipe.
- The inner function from functools.partial object is extracted as well for validation
- Mimic the behavior of pickle module for local lambda function: It would only raise Error for the local function rather than lambda function. So, we will raise warning about local function not lambda function.
```py

>>> import pickle
>>> def fn():
...     lf = lambda x: x
...     pickle.dumps(lf)
>>> pickle.dumps(fn)
AttributeError: Can't pickle local object 'fn.<locals>.<lambda>'
```

This Diff also fixes the Error introduced by pytorch/pytorch#79344

Differential Revision: D37417556

fbshipit-source-id: 7213ee84b34092e0c2cf293ff8bf1dc56659fc83

Summary:
X-link: pytorch/pytorch#80232

Pull Request resolved: meta-pytorch#547

Fixes meta-pytorch#538
- Improve the validation function to raise warning about unpickable function when either lambda or local function is provided to DataPipe.
- The inner function from functools.partial object is extracted as well for validation
- Mimic the behavior of pickle module for local lambda function: It would only raise Error for the local function rather than lambda function. So, we will raise warning about local function not lambda function.
```py

>>> import pickle
>>> def fn():
...     lf = lambda x: x
...     pickle.dumps(lf)
>>> pickle.dumps(fn)
AttributeError: Can't pickle local object 'fn.<locals>.<lambda>'
```

This Diff also fixes the Error introduced by pytorch/pytorch#79344

Differential Revision: D37417556

fbshipit-source-id: c17e475bde703f2f55af140f2155d41efb45f049

Summary:
X-link: pytorch/pytorch#80232

Pull Request resolved: meta-pytorch#547

Fixes meta-pytorch#538
- Improve the validation function to raise warning about unpickable function when either lambda or local function is provided to DataPipe.
- The inner function from functools.partial object is extracted as well for validation
- Mimic the behavior of pickle module for local lambda function: It would only raise Error for the local function rather than lambda function. So, we will raise warning about local function not lambda function.
```py

>>> import pickle
>>> def fn():
...     lf = lambda x: x
...     pickle.dumps(lf)
>>> pickle.dumps(fn)
AttributeError: Can't pickle local object 'fn.<locals>.<lambda>'
```

This Diff also fixes the Error introduced by pytorch/pytorch#79344

Reviewed By: NivekT

Differential Revision: D37417556

fbshipit-source-id: 6babb73a7daad470ec93c3bd0a0c08d71849d3c8

Summary:
X-link: pytorch/pytorch#80232

Pull Request resolved: #547

Fixes #538
- Improve the validation function to raise warning about unpickable function when either lambda or local function is provided to DataPipe.
- The inner function from functools.partial object is extracted as well for validation
- Mimic the behavior of pickle module for local lambda function: It would only raise Error for the local function rather than lambda function. So, we will raise warning about local function not lambda function.
```py

>>> import pickle
>>> def fn():
...     lf = lambda x: x
...     pickle.dumps(lf)
>>> pickle.dumps(fn)
AttributeError: Can't pickle local object 'fn.<locals>.<lambda>'
```

This Diff also fixes the Error introduced by pytorch/pytorch#79344

Reviewed By: NivekT

Differential Revision: D37417556

fbshipit-source-id: 388d04004da43aaf14729cbe465a9247bef6c780

Summary:
Pull Request resolved: #80232

X-link: meta-pytorch/data#547

Fixes meta-pytorch/data#538
- Improve the validation function to raise warning about unpickable function when either lambda or local function is provided to DataPipe.
- The inner function from functools.partial object is extracted as well for validation
- Mimic the behavior of pickle module for local lambda function: It would only raise Error for the local function rather than lambda function. So, we will raise warning about local function not lambda function.
```py

>>> import pickle
>>> def fn():
...     lf = lambda x: x
...     pickle.dumps(lf)
>>> pickle.dumps(fn)
AttributeError: Can't pickle local object 'fn.<locals>.<lambda>'
```

This Diff also fixes the Error introduced by #79344

Test Plan:
```
buck test //caffe2/test:datapipe
buck test //pytorch/data/test:tests
```
Tested in OSS
```
# PT
pytest test/test_datapipe.py -v
# TD
pytest test/test_iterdatapipe.py -v
pytest test/test_mapdatapipe.py -v
pytest test/test_serialization.py -v
# TV
pytest test/test_prototype_builtin_datasets.py -v
```

Reviewed By: NivekT

Differential Revision: D37417556

fbshipit-source-id: 388d04004da43aaf14729cbe465a9247bef6c780