review fix

review from hshen14 fix

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fix error in broadcast and code cleanup

rename bias -> eltwise and added macro to shorten code

formatting

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* "fix compile error"

* "fix ci"

* rerun ci
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* test=develop

rerun ci

This reverts commit 21bb9e91, reversing
changes made to 3fa68dc1.

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* refine reduce by cub
* optimize KernelDepthwiseConvFilterGrad
* optimize depthwise conv and reduce mean and reduce sum
* fix bug: dilation
* cuda arch and cuda 8 compatible

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Add API.spec

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* flags

* "follow comment"

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scope's API modifies its internal state. And scope's
API can be called from multiple threads during traing.
Hence, we need locks to protect the scope's internal
states.

We can optimize it in the future. But the current
solution is buggy.

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* show detail error log on ci

* test

* fix memopt and dist

* update apispec

* will fix different batch issue test=develop

- add naive executor
- fix concurrency performance issue

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* add GraphNum

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* add graph number check in parallelExecutor

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* fix transformer_model bug

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* fix graph num

  extended test_text_classification ot use new op

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- Added draft of new operator

- Added fused embedding fc lstm files

- First time embedding_fc_lstm_fuse_pass was invoked in
  test_text_classification

- Added Embedding pattern

- Not crashing

- Enabled draft of embedding_fc_lstm pass (does it job)

- First working (Seqcompute only) version

- Removed diagnostic comment

- First enabling of BatchCompute

- Disabling pass for embedding with is_sparse and is_distributed

- Cosmetics

- Style

- Style