AttributeError: 'DataLoader' object has no attribute '__code__'

[SongyiGao]

My code:

`
....

algo = Rank(task=task)
algo.train_dataloader = train_dataloader
algo.val_dataloader= val_dataloader
trainer = pl.Trainer()
print("train_dataloader:",algo.train_dataloader)
print("val_dataloader:",algo.val_dataloader)
trainer.fit(algo)
`

The Error massage:

`
train_dataloader: <torch.utils.data.dataloader.DataLoader object at 0x7f679a996e90>
val_dataloader: <torch.utils.data.dataloader.DataLoader object at 0x7f679aabeb10>

Traceback (most recent call last):
File "/home/ubuntu/yi/resarch/quantopt/quantopt/algo/task/task.py", line 158, in
trainer.fit(algo)
File "/home/ubuntu/anaconda3/envs/yi/lib/python3.7/site-packages/pytorch_lightning/trainer/trainer.py", line 552, in fit
self._run(model)
File "/home/ubuntu/anaconda3/envs/yi/lib/python3.7/site-packages/pytorch_lightning/trainer/trainer.py", line 849, in _run
self.config_validator.verify_loop_configurations(model)
File "/home/ubuntu/anaconda3/envs/yi/lib/python3.7/site-packages/pytorch_lightning/trainer/configuration_validator.py", line 34, in verify_loop_configurations
self.__verify_train_loop_configuration(model)
File "/home/ubuntu/anaconda3/envs/yi/lib/python3.7/site-packages/pytorch_lightning/trainer/configuration_validator.py", line 59, in __verify_train_loop_configuration
has_train_dataloader = is_overridden("train_dataloader", model)
File "/home/ubuntu/anaconda3/envs/yi/lib/python3.7/site-packages/pytorch_lightning/utilities/model_helpers.py", line 68, in is_overridden
instance_code = getattr(instance_attr, "patch_loader_code", None) or instance_attr.code
AttributeError: 'DataLoader' object has no attribute 'code'
`

[awaelchli]

Hello

You are patching your module:

algo.train_dataloader = train_dataloader
algo.val_dataloader= val_dataloader

This is most likely the reason you see this error. These are not attributes, but methods on the LightningModule. You need to implement these methods or patch them properly with a callable, although I don't recommend the latter. See our documentation for data here: https://pytorch-lightning.readthedocs.io/en/latest/guides/data.html#using-lightningdatamodule

[DYF-AI]

变量名和函数名重复，变量名覆盖函数名，导致lightning的val_dataloader函数被覆盖了