Error on AWS/Ubuntu/GPU machine when importing `inpainter`

[Julia Turc]

Error on AWS VM (Ubuntu, with GPU) when attempting from detextify import inpainter:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/ubuntu/detextify-venv/lib/python3.8/site-packages/detextify/inpainter.py", line 7, in <module>
    import torch
  File "/home/ubuntu/detextify-venv/lib/python3.8/site-packages/torch/__init__.py", line 805, in <module>
    from .functional import *  # noqa: F403
  File "/home/ubuntu/detextify-venv/lib/python3.8/site-packages/torch/functional.py", line 8, in <module>
    import torch.nn.functional as F
  File "/home/ubuntu/detextify-venv/lib/python3.8/site-packages/torch/nn/__init__.py", line 1, in <module>
    from .modules import *  # noqa: F403
  File "/home/ubuntu/detextify-venv/lib/python3.8/site-packages/torch/nn/modules/__init__.py", line 2, in <module>
    from .linear import Identity, Linear, Bilinear, LazyLinear
  File "/home/ubuntu/detextify-venv/lib/python3.8/site-packages/torch/nn/modules/linear.py", line 7, in <module>
    from .. import functional as F
  File "/home/ubuntu/detextify-venv/lib/python3.8/site-packages/torch/nn/functional.py", line 18, in <module>
    from .._jit_internal import boolean_dispatch, _overload, BroadcastingList1, BroadcastingList2, BroadcastingList3
  File "/home/ubuntu/detextify-venv/lib/python3.8/site-packages/torch/_jit_internal.py", line 39, in <module>
    import torch.distributed.rpc
  File "/home/ubuntu/detextify-venv/lib/python3.8/site-packages/torch/distributed/rpc/__init__.py", line 74, in <module>
    from .server_process_global_profiler import (
  File "/home/ubuntu/detextify-venv/lib/python3.8/site-packages/torch/distributed/rpc/server_process_global_profiler.py", line 6, in <module>
    from torch.autograd.profiler_legacy import profile
  File "/home/ubuntu/detextify-venv/lib/python3.8/site-packages/torch/autograd/__init__.py", line 17, in <module>
    from .gradcheck import gradcheck, gradgradcheck
  File "/home/ubuntu/detextify-venv/lib/python3.8/site-packages/torch/autograd/gradcheck.py", line 3, in <module>
    import torch.testing
ModuleNotFoundError: No module named 'torch.testing'