Fix input<tensor> (#14208)
* fix input<tensor>
test=develop
* fix split_ids
test=develop
* ElementwiseMul should not support SelectedRows
* fix scale op
test=develop
* change GetTensorFromVar() method to GetTensorOrSelectedRowsFromVar()
* fix operator
* refine MultiOutput
* fix MultiOutput
test=develop
* disable test_dist_save_load
test=develop
* fix elementwise_op
test=develop
* add get_sparse_as_op
test=develop
* add info for check
test=develop
* rename get_sparse_as_op with extract_rows_as_op.
test=develop
* elementwise doesn't support selected_rows
* fix regularizer
* remove extract_rows_as
test=develop
* fix ci
test=develop
* add test for sum_op
* fix regularizer
test=develop
* test=develop
* fix pserver weight decay multi inputs test=develop
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chengduo
minqiyang
Luo Tao