How is the 128(BATCH_SIZE) RoIs sent to ID net

[DaisyJiao]

For example, in the training log,
I0816 01:36:36.621873 36439 layer_factory.hpp:74] Creating layer feat_lowdim
I0816 01:36:36.621896 36439 net.cpp:99] Creating Layer feat_lowdim
I0816 01:36:36.621906 36439 net.cpp:479] feat_lowdim <- caffe.Pooling_168_caffe.Pooling_168_0_split_2
I0816 01:36:36.621978 36439 net.cpp:130] This layer is inheriting previous layer's sync mode: 1
I0816 01:36:36.621999 36439 net.cpp:435] feat_lowdim -> feat_lowdim
I0816 01:36:36.622017 36439 net.cpp:163] Setting up feat_lowdim
I0816 01:36:36.625612 36439 net.cpp:170] Top shape: 1 256 (256)

The top shape of identification net is 1N instead of 128N.