import tensorflow as tf
(X_train, y_train), (X_test, y_test) = tf.keras.datasets.mnist.load_data()
from tensorflow.keras.utils import np_utils
X_train=X_train.astype('float32')
X_test=X_test.astype('float32')
X_train/=255
X_test/=255
X_train = X_train.reshape(X_train.shape[0], 28, 28, 1).astype('float32')
X_test = X_test.reshape(X_test.shape[0], 28, 28, 1).astype('float32')
y_train = np_utils.to_categorical(y_train, 10)
y_test = np_utils.to_categorical(y_test, 10)
model = Sequential()
model.add(Convolution2D(32, 3, 3, input_shape=(28, 28, 1)))
model.add(Activation('relu'))
model.add(Dropout(0.25))
model.add(Convolution2D(32, 3, 3))
model.add(Activation('relu'))
model.add(Convolution2D(32, 3, 3))
model.add(Activation('relu'))
model.add(Dropout(0.25))
model.add(Flatten())
model.add(Dense(128))
model.add(Dense(128))
model.add(Activation('relu'))
model.add(Dense(10))
model.add(Activation('softmax'))
model.compile(loss='categorical_crossentropy',optimizer='adam',metrics=['accuracy'])

import datetime
!rm -rf ./logs/
log_dir = "logs/fit/" + datetime.datetime.now().strftime("%Y%m%d-%H%M%S")
tensorboard_callback=tf.keras.callbacks.TensorBoard(log_dir=log_dir, histogram_freq=1)
model.fit(x=X_train, y=y_train,epochs=30,validation_data=(X_test, y_test),  callbacks=[tensorboard_callback])

%load_ext tensorboard
%tensorboard --logdir logs/fit
from tensorboard import notebook
notebook.list
notebook.display(port=6006, height=1000)