Remove `clean_tag` from tensorboard (#33133)
Summary:
The function originally comes from https://github.com/tensorflow/tensorflow/blob/4279f99847e9fcce9410bda61d3b71065e0df65f/tensorflow/python/ops/summary_op_util.py#L45-L68
As its comment says:
```
# In the past, the first argument to summary ops was a tag, which allowed
# arbitrary characters. Now we are changing the first argument to be the node
# name. This has a number of advantages (users of summary ops now can
# take advantage of the tf name scope system) but risks breaking existing
# usage, because a much smaller set of characters are allowed in node names.
# This function replaces all illegal characters with _s, and logs a warning.
# It also strips leading slashes from the name.
```
This function is only for compatibility with TF's operator name restrictions, and is therefore no longer valid in pytorch. By removing it, tensorboard summaries can use more characters in the names.
Before:
After:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33133
Differential Revision: D20089307
Pulled By: ezyang
fbshipit-source-id: 3552646dce1d5fa0bde7470f32d5376e67ec31c6
