Fixed comm parser issue

[shengfukevin]

Summary:
This DIFF is to fix the following two comm parser issue:

1. process_group:init changed backend_id to uid
2. record_param_comms changed input size from 8 to 10

Differential Revision: D56091619

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D56091619

[meta-cla]

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