Solved by Vasiliy_Kuznetsov in post #2 
              
              
                If the intent is to dequantize and want to do conv_1_4 in fp32, then the problem is that by default, the quantization APIs quantize all convolutions in the model.  The workaround would be to disable quantization for conv_1_4, like this: 
model.qconfig = ...
# disable quant for a specific layer
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