Remove truth only if smaller than 1x1 pix during training

AlexeyAB

2018-04-10 2ce6460c79e06caa33eab3991ee3e7fd9f0909d6

 src/activation_layer.c

@@ -21,7 +21,12 @@
    l.output = calloc(batch*inputs, sizeof(float*));
    l.delta = calloc(batch*inputs, sizeof(float*));

    l.forward = forward_activation_layer;
    l.backward = backward_activation_layer;
#ifdef GPU
    l.forward_gpu = forward_activation_layer_gpu;
    l.backward_gpu = backward_activation_layer_gpu;

    l.output_gpu = cuda_make_array(l.output, inputs*batch);
    l.delta_gpu = cuda_make_array(l.delta, inputs*batch);
#endif