Using mean pixel instead of mean image in classification/example.py

[mfernezir]

https://github.com/NVIDIA/DIGITS/blob/master/examples/classification/example.py#L69-L83

It seems this is a leftover from a solved bug in the actual DIGITS classification procedure which hasn't been updated for the example.py script. #169

[lukeyeager]

See #557.

Doing mean pixel subtraction is the safe choice since this script doesn't know which method was used when the model was created (which could be addressed with #228).

[mfernezir]

Ok...at the moment, it's definitely one more "gotcha" to be aware of.

[lukeyeager]

@gheinrich's pull request at #573 should help. We'll deprecate the classification example and encourage users to use tools/inference.py directly.

Provide command-line inferface for inference using exactly the same path as DIGITS

[mfernezir]

Thanks, I'll have a look at that!

[gheinrich]

No response => closing. Thanks for the report!