Change pip to correct version when install wheel package

* Enable BatchNorm to use global mean and variane during training
* Update doc and follow comments.

Remove test_recognize_digits_mlp from Mac

Fix data download of wmt16

* add doc for scope

* update doc for force_init_on_cpu
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* follow comment test=develop

* update format test=develop

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Softmax for inference MKL further changes

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gzstream depend on the zlib in thirdparty

fix word2vec bug

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Revert the changes of VLOG

Loose atol in test_pe_test_wwhile_train

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Enhance hierarchical sigmoid op

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* optimize bilinear_tensor_product
* add set zero to set grad to 0.

EltwiseMul: Changes from previous PR

Fix the invalid list operation on save_inference_model function.

Add ctr reader

fix the build issue on manylinux1

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Protect important header files.