Gender-Age random predictions

[RomanSteinberg]

Hi,
I'm not very familiar with mxnet and I have a problem with gender-age model from this repo. I noticed that it predicts different results depends on some third side code. I tried to make a minimal example. So, it loads model, takes first operation called ‘_minus_scalar0’, which should subtract 127.5 from the input matrix. But it is not! If you look at the screenshot, you can see that it subtracts 127.0 only.

Important. If I comment line 8, the code works correctly and predicts the correct age if I specify fc1 output. I don’t understand why. I reproduced this issue on 3 computers from 4.

1. What symbol operation corresponds to _minus_scalar? I checked broadcast_minus and broadcast_sub, these are not _minus_scalar operations.
2. How can I fix incorrect subtraction?

[RomanSteinberg]

@nttstar can you, please, specify what operation corresponds to _minus_scalar? I haven't found any code corresponding to gender-age model architecture.

[nttstar]

Just for input pre-processing, it is defined in network symbol.

[RomanSteinberg]

I found out that this issue is not about gender-age model of this repo. I made a minimal example with only one operation - subtraction and it still works incorrect. So, I posted issue in mxnet repo, because it is primary.