2018-03-26 09:59:00.481670: I tensorflow/core/platform/cpu_feature_guard.cc:137] Your CPU supports instructions that this TensorFlow binary was not compiled to use: SSE4.1 SSE4.2 AVX AVX2 FMA
This warning message indicates that you would reach better performance if you compiled TensorFlow manually for your specific processor (instead of just installing it via conda), which is not a trivial thing to do, so you can just ignore that warning.
/Users/tracy/anaconda3/envs/py35_knime/lib/python3.5/site-packages/keras/models.py:252: UserWarning: No training configuration found in save file: the model was not compiled. Compile it manually.
warnings.warn('No training configuration found in save file: ’
This means that Keras did not detect a training configuration when it loaded the network. That’s okay, we’ll compile it (i.e. set a training configuration) manually in the learner node.
ERROR PythonKernel Exception ignored in: <bound method BaseSession.del of <tensorflow.python.client.session.Session object at 0x115736470>>
ERROR PythonKernel TypeError: ‘NoneType’ object is not callable
This is some weird error message issued by TensorFlow (bug report) which does not affect the correct execution of the network. So you can also ignore that.