第一次使用服务器，问一下如果训练缺少机器学习要用的库文件怎么安装

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ModuleNotFoundError Traceback (most recent call last)
in ()
----> 1 import tensorflow as tf
2 import keras
3 from keras.models import Sequential
4 from keras.layers import Dense, Dropout, Activation, Reshape, Conv2D, AveragePooling2D, Flatten
5 from keras.layers import MaxPooling2D

ModuleNotFoundError: No module named 'tensorflow'