Solved by ptrblck in post #2 
              
              
                inception_v3 expects a color image (3 channels). 
The error message seems to be a bit strange and should be: 
RuntimeError: Given groups=1, weight of size [32, 3, 3, 3], expected input[10, 1, 299, 299] to have 3 channels, but got 1 channels instead

Did you modify the architecture somehow? 
Anyway, …