backend cntk: TypeError: '<' not supported between instances of 'Function' and 'float'

[mw66]

just run the example from keras:

$ python examples/mnist_siamese.py
Using CNTK backend
Selected GPU[0] Tesla K40c as the process wide default device.
Traceback (most recent call last):
File "examples/mnist_siamese.py", line 128, in
model.compile(loss=contrastive_loss, optimizer=rms, metrics=[accuracy])
File "/home/xxx/project/keras/keras/engine/training.py", line 934, in compile
handle_metrics(output_metrics)
File "/home/xxx/project/keras/keras/engine/training.py", line 931, in handle_metrics
mask=masks[i])
File "/home/xxx/project/keras/keras/engine/training.py", line 459, in weighted
score_array = fn(y_true, y_pred)
File "examples/mnist_siamese.py", line 91, in accuracy
return K.mean(K.equal(y_true, K.cast(y_pred < 0.5, y_true.dtype)))
TypeError: '<' not supported between instances of 'Function' and 'float'

Using CNTK backend
keras.version = '2.1.1'

$ git status
On branch master
Your branch is up-to-date with 'origin/master'.
nothing to commit, working directory clean

$ python -c "import cntk; print(cntk.version)"
2.3.1

[gabrieldemarmiesse]

Hi!

This isn't really a bug. It's because you can't use comparaison operators with the cntk backend.
Source: discussion during the cntk integration. #6800
You should use K.greater_than() instead.

If it solves your problem, feel free to close the issue.