Peng Sun

Add MbyN sparsity schedulers

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This PR introduce two new schedulers for M_by_N sparsity   - PolynomialDecayMbyNSparsity   - ConstantMbyNSparsity #### [ConstantMbyNSparsity](https://github.com/tensorflow/model-optimization/pull/855/files#diff-15df3b8c3fdb2a06997a17f8c698e97b2e5533f85822bcba244be45b7d92f8bdR262-R277) Pruning model at step `prune_step`, that is,  m_by_n sparsity masks calculate only at `prune_step` then...

TESTs Failed: kernels:unsorted_segment_{prod, max, min, sum}_test

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Click to expand! ### Issue Type Bug ### Source source ### Tensorflow Version latest master branch ### Custom Code No ### OS Platform and Distribution Ubuntu 9.4.0-1ubuntu1~18.04 ### Mobile device...

[BugFix][MSC] split name_string with index by colon from the right

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Fixes a naming mismatch in MSCGraph where tensor_name could formatted as 'string:index:index',and the corresponding node.name is 'string:index'. Splitting tensor_name from the right aligns it correctly. For example, the TFLite default...