CVE-2020-15201: In Tensorflow before version 2.3.1, the `RaggedCountSparseOutput` implementation does not validate that the input argume

TensorFlow versions before 2.3.1 have a bug in the `RaggedCountSparseOutput` function where it doesn't properly check that input arguments are valid ragged tensors (a special data structure for storing data with varying lengths). This missing validation can cause a heap buffer overflow (reading memory outside the allowed bounds), which could crash the program or potentially allow attackers to execute code.