fix numpy dll missing issue with anaconda python on windows #317
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unit test and pretrained model test with matrix are failing recently.
the root cause is:
anaconda updates its python package with dll lookup logic changed.
it causes numpy fails to find required dll on Windows.
more information here:
numpy/numpy#12957
ContinuumIO/anaconda-issues#10629
as a workaround, add numpy lib directory to path explicitly to resolve this issue.
eventually, we should use raw python instead of anaconda.
the reason that anaconda is used currently is: shared python so is missing for azure pipeline hosted agent, which causes onnxruntime failure.