Set torch version to 1.8.1

[GutiPerez]

Hello

torch has been updated to version 1.9.0, and as the requirement for torch is >=1.5.1, the package is updated when installing BindsNET. Because some changes made to torch in this new version, there are errors because some imports does not exist anymore, like container_abcs and int_classes from _torch.six in the file collate.py (although it occurs also in another files).

I guess that you should fix torch version to 1.8.1 until the impact from this new version is evaluated in more detail.

[Hananel-Hazan]

Good catch! thank you for lets us know.
push freeze 1.8.1 #497

[Hananel-Hazan]

Fix the issues cause by PyTorch 1.9.0 #499
Let me know if you have any issues

[GutiPerez]

There are still some issues.

In the file collate.py, on line 76, in the function isinstance, the argument int_classes does not exists, as you have deleted the import. But you forgot to change that argument. Putting a simple "int" instead solves the issue, as the import from torch._six was importing that.

Then, in the same file, but now on lines 80 and 84, in the function isinstance again, the argument container_abcs does not exist, again, because the import was deleted. You imported collections, but forgot to change those arguments. Make the following import fixes the issue: "import collections.abc as container_abcs".

That is only on the file collate.py, but there could be more instances of the same problems in another files.

[Hananel-Hazan]

Good catch and thanks for the help!
#500