Fix for windows builds with python 3.10 , getting rid of ssize_t

[atalman]

Fix for windows builds with python 3.10 , getting rid of ssize_t. Since its not a standart type.

This is to fix error when building with Python 3.10 on windows:
Ref: https://app.circleci.com/pipelines/github/pytorch/text/4984/workflows/5df0236c-4758-412d-8a08-e50aa120be39/jobs/166014

Error details:

C:\Users\circleci\project\torchtext\csrc\register_pybindings.cpp(123): error C2065: 'ssize_t': undeclared identifier
C:\Users\circleci\project\torchtext\csrc\register_pybindings.cpp(123): error C2146: syntax error: missing ';' before identifier 'length'
C:\Users\circleci\project\torchtext\csrc\register_pybindings.cpp(123): error C2065: 'length': undeclared identifier
C:\Users\circleci\project\torchtext\csrc\register_pybindings.cpp(124): error C2065: 'length': undeclared identifier
C:\Users\circleci\project\torchtext\csrc\register_pybindings.cpp(125): error C2065: 'length': undeclared identifier
C:\Users\circleci\project\torchtext\csrc\register_pybindings.cpp(130): error C2065: 'ssize_t': undeclared identifier
C:\Users\circleci\project\torchtext\csrc\register_pybindings.cpp(130): error C2146: syntax error: missing ';' before identifier 'length'
C:\Users\circleci\project\torchtext\csrc\register_pybindings.cpp(130): error C2065: 'length': undeclared identifier
C:\Users\circleci\project\torchtext\csrc\register_pybindings.cpp(131): error C2065: 'length': undeclared identifier
C:\Users\circleci\project\torchtext\csrc\register_pybindings.cpp(132): error C2065: 'length': undeclared identifier
C:\Users\circleci\project\torchtext\csrc\register_pybindings.cpp(147): error C2065: 'ssize_t': undeclared identifier
C:\Users\circleci\project\torchtext\csrc\register_pybindings.cpp(147): error C2146: syntax error: missing ';' before identifier 'length'
C:\Users\circleci\project\torchtext\csrc\register_pybindings.cpp(147): error C2065: 'length': undeclared identifier
C:\Users\circleci\project\torchtext\csrc\register_pybindings.cpp(148): error C2065: 'length': undeclared identifier
C:\Users\circleci\project\torchtext\csrc\register_pybindings.cpp(150): error C2065: 'length': undeclared identifier
ninja: build stopped: subcommand failed.
Traceback (most recent call last):
  File "C:\Users\circleci\project\env\lib\site-packages\torch\utils\cpp_extension.py", line 1726, in _run_ninja_build
    subprocess.run(
  File "C:\Users\circleci\project\env\lib\subprocess.py", line 524, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['ninja', '-v']' returned non-zero exit status 1.

Similar PR for pytorch core here and here

Summary for usage guidelines:
Use Py_ssize_t when calling Python API
Use c10::irange to automatically infer loop type
Use size_t or unsigned for unsigned type

Reference issue: here

[codecov]

Codecov Report

Merging #1627 (1bf8a51) into main (81212ba) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1627   +/-   ##
=======================================
  Coverage   85.31%   85.31%           
=======================================
  Files          58       58           
  Lines        2492     2492           
=======================================
  Hits         2126     2126           
  Misses        366      366           

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[malfet]

Can you please pass a reference to similar PR for PyTorch and explain why ssize_t should not be used in codebase?

[atalman]

Similar PR for pytorch core here and here

Summary for usage guidelines:
Use Py_ssize_t when calling Python API
Use c10::irange to automatically infer loop type
Use size_t or unsigned for unsigned type

Reference issue: here