No `test_dataloader()` method defined to run `Trainer.test`

[AnkitSinha123]

Epoch 1: 50%|▍| 201/404 [01:29<01:30, 2.25it/s, loss=0.116, v_num=0, train/loss_simple_step=0.419, train/loss_vlb_step=0.00246, tra
Saving latest checkpoint...

/mnt/data/ankit/ProSpect/main.py(779)()
-> if not opt.no_test and not trainer.interrupted:
(Pdb) next
/mnt/data/ankit/ProSpect/main.py(780)()
-> trainer.test(model, data)
(Pdb) next
pytorch_lightning.utilities.exceptions.MisconfigurationException: No test_dataloader() method defined to run Trainer.test.

Can you please help me with the issues

[surfingnirvana]

I have the same error on finishing of Epoch 5:

Average Peak memory 12120.32MiB
Epoch 5: 100%|██████████████████████| 101/101 [01:03<00:00, 1.59it/s, loss=0.0902, v_num=0, train/loss_simple_step=0.0691, train/loss_vlb_step=0.000233, train/loss_step=0.0691, global_step=599.0, train/loss_simple_epoch=0.144, train/loss_vlb_epoch=0.00187, train/loss_epoch=0.144]Epoch 5, global step 599: val/loss_simple_ema was not in top 1
Epoch 5: 100%|██████████████████████| 101/101 [01:04<00:00, 1.58it/s, loss=0.0902, v_num=0, train/loss_simple_step=0.0691, train/loss_vlb_step=0.000233, train/loss_step=0.0691, global_step=599.0, train/loss_simple_epoch=0.144, train/loss_vlb_epoch=0.00187, train/loss_epoch=0.144]
Saving latest checkpoint...

Traceback (most recent call last):
File "main.py", line 781, in
trainer.test(model, data)
File "C:\Users\USER1\anaconda3\envs\prospect\lib\site-packages\pytorch_lightning\trainer\trainer.py", line 911, in test
return self._call_and_handle_interrupt(self._test_impl, model, dataloaders, ckpt_path, verbose, datamodule)
File "C:\Users\USER1\anaconda3\envs\prospect\lib\site-packages\pytorch_lightning\trainer\trainer.py", line 685, in _call_and_handle_interrupt
return trainer_fn(*args, **kwargs)
File "C:\Users\USER1\anaconda3\envs\prospect\lib\site-packages\pytorch_lightning\trainer\trainer.py", line 954, in _test_impl
results = self._run(model, ckpt_path=self.tested_ckpt_path)
File "C:\Users\USER1\anaconda3\envs\prospect\lib\site-packages\pytorch_lightning\trainer\trainer.py", line 1128, in _run
verify_loop_configurations(self)
File "C:\Users\USER1\anaconda3\envs\prospect\lib\site-packages\pytorch_lightning\trainer\configuration_validator.py", line 42, in verify_loop_configurations
__verify_eval_loop_configuration(trainer, model, "test")
File "C:\Users\USER1\anaconda3\envs\prospect\lib\site-packages\pytorch_lightning\trainer\configuration_validator.py", line 186, in __verify_eval_loop_configuration
raise MisconfigurationException(f"No {loader_name}() method defined to run Trainer.{trainer_method}.")
pytorch_lightning.utilities.exceptions.MisconfigurationException: No test_dataloader() method defined to run Trainer.test.

Somebody has a solution here: Lightning-AI/pytorch-lightning#11437

you need to pass in the datamodule to trainer.test.

I do not know how to do it.

[AnkitSinha123]

@surfingnirvana

I found the solution,

In the main file just change

trainer_kwargs["max_steps"] = trainer_opt.max_steps -->
trainer_kwargs["max_steps"] = opt.max_steps

It will work

[surfingnirvana]

Thank you it works!

[Rbrq03]

Not sure why but it works for me!
However, should we add an argument in the training script to set the max_training_steps? Seems that using the example script will heavily extend training epochs.