add progress bar to TracInCPFastRandProj.__init__

[99warriors]

Summary:

• adds progress bar for computation done in TracInCPFastRandProj.__init__, as well as a show_progress argument
• actual computation is done in TracInCPFastRandProj._get_intermediate_quantities_tracincp_fast_rand_proj. This method is changed so that the outer loop is over training batches (as opposed to over checkpoints), so that it is actually possible to report how many batches have been processed.
• add a new "mode" to test_tracin_show_progress and use it to test.

Differential Revision: D34803544

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D34803544

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D34803544

[facebook-github-bot]

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