What is the key of "inputs" mean in data?

[hailong23-jin]

https://github.com/open-mmlab/mmpretrain/blob/main/mmpretrain/models/utils/data_preprocessor.py#L108C15-L108C15

# this is the data content
{'data_samples': [<DataSample(

META INFORMATION
    img_path: /home/jinhl/PythonWorkspace/ours/mmpretrain/data/CultivatedLand/others/12_42.png
    sample_idx: 60

DATA FIELDS
    gt_label: tensor([1])

) at 0x7f2640e051f0>, <DataSample(

META INFORMATION
    img_path: /home/jinhl/PythonWorkspace/ours/mmpretrain/data/CultivatedLand/others/14_40.png
    sample_idx: 72

DATA FIELDS
    gt_label: tensor([1])

) at 0x7f2640e05160>]}

# this is the error
Traceback (most recent call last):
  File "tools/train.py", line 166, in <module>
    main()
  File "tools/train.py", line 162, in main
    runner.train()
  File "/home/jinhl/anaconda3/envs/py38/lib/python3.8/site-packages/mmengine/runner/runner.py", line 1735, in train
    model = self.train_loop.run()  # type: ignore
  File "/home/jinhl/anaconda3/envs/py38/lib/python3.8/site-packages/mmengine/runner/loops.py", line 96, in run
    self.run_epoch()
  File "/home/jinhl/anaconda3/envs/py38/lib/python3.8/site-packages/mmengine/runner/loops.py", line 112, in run_epoch
    self.run_iter(idx, data_batch)
  File "/home/jinhl/anaconda3/envs/py38/lib/python3.8/site-packages/mmengine/runner/loops.py", line 128, in run_iter
    outputs = self.runner.model.train_step(
  File "/home/jinhl/anaconda3/envs/py38/lib/python3.8/site-packages/mmengine/model/base_model/base_model.py", line 113, in train_step
    data = self.data_preprocessor(data, True)
  File "/home/jinhl/anaconda3/envs/py38/lib/python3.8/site-packages/torch/nn/modules/module.py", line 1110, in _call_impl
    return forward_call(*input, **kwargs)
  File "/home/jinhl/PythonWorkspace/ours/mmpretrain/mmpretrain/models/utils/data_preprocessor.py", line 110, in forward
    inputs = self.cast_data(data['inputs'])
KeyError: 'inputs'

I am using CustomDataset, and give two folders,

however, when I am starting training, it raises an error,

I search all codes for where add the key "inputs" to data, but found nothing.

Then I print the data content as above, there is no "inputs" key, Do I need to add it by myself？

Can anyone help me, it is my first time to use this package.

[hailong23-jin]

I found the reason, it's because I didn't add LoadFromFile to config file.