TensorFlow 1.13.1 warning

[njzjz]

Maybe deepmd needs some changes if it plans to support for subsequent TensorFlow versions.

# DEEPMD: computed energy bias
WARNING:tensorflow:From /home/jzzeng/anaconda3/lib/python3.7/site-packages/tensorflow/python/framework/op_def_library.py:263: colocate_with (from tensorflow.python.framework.ops) is deprecated and will be removed in a future version.
Instructions for updating:
Colocations handled automatically by placer.
# DEEPMD: built lr
WARNING:tensorflow:From /home/jzzeng/deepmd_root/bin/../lib/deepmd/Model.py:890: to_double (from tensorflow.python.ops.math_ops) is deprecated and will be removed in a future version.
Instructions for updating:
Use tf.cast instead.
# DEEPMD: built network
WARNING:tensorflow:From /home/jzzeng/anaconda3/lib/python3.7/site-packages/tensorflow/python/ops/math_ops.py:3066: to_int32 (from tensorflow.python.ops.math_ops) is deprecated and will be removed in a future version.
Instructions for updating:
Use tf.cast instead.