TypeError: __array__() takes 1 positional argument but 2 were given

To solve TypeError: __array__() takes 1 positional argument but 2 were given error follow below methods.

ERROR LOG

TypeError: Caught TypeError in DataLoader worker process 0.
Original Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/torch/utils/data/_utils/worker.py", line 287, in _worker_loop
    data = fetcher.fetch(index)
  File "/usr/local/lib/python3.6/dist-packages/torch/utils/data/_utils/fetch.py", line 44, in fetch
    data = [self.dataset[idx] for idx in possibly_batched_index]
  File "/usr/local/lib/python3.6/dist-packages/torch/utils/data/_utils/fetch.py", line 44, in <listcomp>
    data = [self.dataset[idx] for idx in possibly_batched_index]
  File "/usr/local/lib/python3.6/dist-packages/torch/utils/data/dataset.py", line 311, in __getitem__
    return self.dataset[self.indices[idx]]
  File "main.py", line 64, in __getitem__
    img, target = self.transforms(img, target)
  File "/transforms.py", line 26, in __call__
    image, target = t(image, target)
  File "/usr/local/lib/python3.6/dist-packages/torch/nn/modules/module.py", line 1051, in _call_impl
    return forward_call(*input, **kwargs)
  File "/transforms.py", line 50, in forward
    image = F.to_tensor(image)
  File "/usr/local/lib/python3.6/dist-packages/torchvision/transforms/functional.py", line 129, in to_tensor
    np.array(pic, mode_to_nptype.get(pic.mode, np.uint8), copy=True)
TypeError: __array__() takes 1 positional argument but 2 were given

Why TypeError: __array__() takes 1 positional argument but 2 were given occurs ?

The issue is with the Pillow 8.3.0 version. This problem could also be resolved by upgrading Pillow from version 8.3.0 to 8.3.1. I experienced the same problem with

torch==1.9.0+cu111
torchvision==0.10.0+cu111
Pillow==8.3.0

After Pillow was upgraded to 8.3.1 (with no change to torch and torchvision) as below, the issue is gone:

pip install --upgrade pillow

How to solve TypeError: __array__() takes 1 positional argument but 2 were given ?

I think the problem comes from pypi Pillow 8.2.0 -> 8.3.0 update . Try Downgrading the Pillow version with the help of below code :

pip install pillow==8.2.0

Alternative to Solve TypeError: __array__() takes 1 positional argument but 2 were given

You may also get the same issue when you are using torch==1.9.0 and torchvision==0.10.0 . Then I downgraded the torch library in my requirements.txt file, which forced me to downgrade torchvision, which fixed the error for me. I ended up using the following library versions, which did not cause the error:

torch==1.8.1
torchvision==0.9.1

Hope the above solution works.

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