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[QUANTIZE] Refactor quantization codebase and fix model accuracy #3762

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[QUANTIZE] Refactor quantization codebase and fix model accuracy #3762

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ZihengJiang
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A mirror PR of #3543 due to CI error.

  • Separate quantization code base into different files: partition.cc, annotate.cc, realize.cc
  • Change rewrite_for_vta to extra partition pass and enable it by default
  • Change annotation.force_cast(x) to annotation.cast_hint(x, dtype)
  • Remove qconfig.store_lowbit_output and enable it by default
  • Fixed accuracy of models like mobilenet：
    • resnet18_v1(8-16bit): 69.29%
    • resnet18_v1(8-32bit): 69.29%
    • resnet34_v1: 73.33%
    • resnet50_v1: 74.78%
    • resnet101_v1: 75.66%
    • mobilenetv2_1.0: 66.64%

@tmoreau89
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@nhynes do you happen to know why the rust CI error is occurring on this PR? Thanks!

@tmoreau89 tmoreau89 mentioned this pull request Aug 14, 2019
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@ZihengJiang ZihengJiang deleted the quantize-test-ci branch August 15, 2019 09:32
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@ZihengJiang @tmoreau89 @mingwayzhang