add quantization debug util to pretty print FX graphs (#43910)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/43910
Adds a debug function to get a representation of all nodes in the
graph, such as
```
name op target args kwargs
x plchdr x () {}
linear_weight gt_prm linear.weight () {}
add_1 cl_fun <bi_fun add> (x, linear_weight) {}
linear_1 cl_mod linear (add_1,) {}
relu_1 cl_meth relu (linear_1,) {}
sum_1 cl_fun <bi_meth sum> (relu_1,) {'dim': -1}
topk_1 cl_fun <bi_meth topk> (sum_1, 3) {}
```
using only Python STL. This is useful for printing internal state of
graphs when working on FX code.
Has some on-by-default logic to shorten things so that node reprs for
toy models and unit tests fit into 80 chars.
Flexible on function name and location, I care more that this is
accessible from both inside PT as well as from debug scripts which
are not checked in.
Test Plan:
see
https://gist.github.com/vkuzo/ed0a50e5d6dc7442668b03bb417bd603 for
example usage
Imported from OSS
Reviewed By: jerryzh168
Differential Revision: D23435029
fbshipit-source-id: 1a2df797156a19cedd705e9e700ba7098b5a1376
