UniformQuantLearner, if Net is full Conv net, no active layer, how this method work

[tianylijun]

class UniformQuantization:
# TODO: add more types of activations and matmuls
self.support_act_types = ['Relu', 'Relu6', 'Crelu', 'Elu', 'Selu', 'Softplus',
'Softsign', 'Sigmoid', 'Tanh']
self.support_mul_types = ['Conv2D', 'MatMul', 'DepthwiseConv2dNative']

a common problem, we want do quantization on conv layer, not only on active layer. Worst
case is a full Conv Net(no active layer), how this method work?