Add sparse concat operator support

awslabs / keras-apache-mxnet

[DEPRECATED] Amazon Deep Learning's Keras with Apache MXNet support

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Closed kalyc closed 5 years ago

kalyc commented 6 years ago

Add sparse support for concat operator

[x] This PR requires new unit tests [y/n] (make sure tests are included)
[ ] This PR requires to update the documentation [y/n] (make sure the docs are up-to-date)
[x] This PR is backwards compatible [y/n]
[ ] This PR changes the current API [y/n]