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You can start an interactive Keras session on the login nodes by loading the corresponding modules and starting the Python interpreter.

[leonhard@euler10 ~]$ module load new gcc/4.8.2 python/3.6.0
Autoloading openblas/0.2.13_seq and sqlite/3.15.0
[leonhard@euler10 ~]$ python
Python 3.6.0 (default, Feb 10 2017, 09:00:08) 
[GCC 4.8.2] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import keras
Using TensorFlow backend.
>>> keras.__version__

Please note that you should use interactive sessions only for very short test that do not use a lot of CPU capacity. You have to submit all other computations as a batch job.