Very low test mIoU

[Fansiee]

I train the Resnet50 70000iters on voc 2007, but the test mIoU is just 0.29.
And I change the code according to the #2, but get lower mIoU which is just 0.128

[CharlesShang]

I'm sorry about it.
I must commit a wrong config last month. And I'm also trying to locate the problem.
Suggestions:

1. check the recall rate for rpn outputs: write some code in anchor_target_layer_tf.py
2. check build_losses(): roll back to early commit without OHEM

[Fansiee]

Thank you very much!