TensorFlow API r1.8 Python tf.keras.backend.cos tf.keras.backend.cos(x) Defined in tensorflow/python/keras/_impl/keras/backend.py. Computes cos of x element-wise. Arguments: x: Tensor or variable. Returns: A tensor. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated August 17, 2018.