* use less event records

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* add temp parallel ctx for single card

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* dev_compare_cfg_file

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* add broadcast_like module

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* A more efficient implementation of NLL Loss

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remove MakeParallelDescByDevice, fix the missing setting of parallel_desc in InstructionMsg copy constructor (#4850)

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* add experimental apis

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* add scalar input support

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* infer shape in main thread and fix multi-thread bug

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* void -> Maybe<void>

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* fix typo

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* add broadcast matmul support

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* add ones_like and zeros_like op with tests

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* device_infer_fn

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* rebase master

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* initial commit

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* Serialize proto in binary rather than text

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* add pow module

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* device_infer_fn

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* feat(Optim): add sgd

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* feat(Optim): add sgd

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* Accumulate partial grad to acc tensor promptly.

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* fix(*): fix bugs and add zeros op

* Capture detached output tensors.

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* fix crossentropy_loss bug

* fix comment

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* add negative and nllloss module

* add negative and nllloss module

* add negative and nllloss module

* add negative and nllloss module

* add nllloss impleted, relay on other module, do not merge now

* fix nllloss bug

* support 2d nllloss bug

* fix comment

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* Serialize proto in binary rather than text

* refine

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