Keras-TF issue

from __future__ import absolute_import
from __future__ import print_function
import numpy as np
from keras.preprocessing import sequence
from keras.optimizers import SGD, RMSprop, Adagrad, Adadelta
from keras.utils import np_utils
from keras.models import Sequential
from keras.layers.core import Dense, Dropout, Activation, TimeDistributedDense, Flatten, Permute, Reshape
from keras.layers.embeddings import Embedding
from keras.layers.recurrent import LSTM, GRU, SimpleRNN
from keras.callbacks import ModelCheckpoint, Callback