BIT-TENSORFLOW-2020-5215 Segmentation faultin TensorFlow when converting a Python string to tf.float16

In TensorFlow before 1.15.2 and 2.0.1, converting a string from Python to a tf.float16 value results in a segmentation fault in eager mode as the format checks for this use case are only in the graph mode. This issue can lead to denial of service in inference/training where a malicious attacker c...