fix block.export (#17970)

[jmracek]

This PR cherry-picks commit 5122d32 into the v1.x branch. This is to enable the export of models where dangling layers are optimized out during symbol export. For more information, see here and here.

• fix block.export

net.hybridize may optimize out some ops. These ops are alive in nn.Block(also nn.HybridBlock), but its names are not contained in symbol's arg_names list. So ignore these ops except that their name are end with 'running_mean' or 'running_var'.

• Update block.py

let user can save their extra param.

• add allow_extra

add allow_extra to let user decide whether to save extra parameters or not.

• Update block.py

add moving_mean and moving_var when export model with SymbolBlock

• Update python/mxnet/gluon/block.py

typo

Co-authored-by: Sheng Zha szha@users.noreply.github.com

• Update block.py

• Update block.py

• Update python/mxnet/gluon/block.py

Co-authored-by: Leonard Lausen leonard@lausen.nl

Co-authored-by: Sheng Zha szha@users.noreply.github.com
Co-authored-by: Leonard Lausen leonard@lausen.nl

Description

(Brief description on what this PR is about)

Checklist

Essentials

• PR's title starts with a category (e.g. [BUGFIX], [MODEL], [TUTORIAL], [FEATURE], [DOC], etc)
• Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage
• Code is well-documented

Changes

• Feature1, tests, (and when applicable, API doc)
• Feature2, tests, (and when applicable, API doc)

Comments

• If this change is a backward incompatible change, why must this change be made.
• Interesting edge cases to note here

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[szha]

thanks for the backport!