Does spp pooling and RoI pooling support back propagation?

yhenon / keras-spp

Spatial pyramid pooling layers for keras

MIT License

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Does spp pooling and RoI pooling support back propagation? #4

Closed Yifan-Gao closed 7 years ago

Yifan-Gao commented 7 years ago

I'm new to keras. It seems the spp pooling layer and RoI pooling layer just support forward operation. Can it be used to train a new network via back propagation?

yhenon commented 7 years ago

Hi, Backpropagation is supported with both the theano and tensorflow backend.

Both libraries perform the backpropagation step automatically (you may want to read up on automatic differentiation / symbolic differentiation). As such it is not necessary to write extra code for the backwards pass.