r2.8 cherry-pick: 1b85a28d395 "Fix TensorKey hash function."#56016
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The original hash function only used total estimated `AllocatedBytes()`, which (a) is an estimate per tensor, and (b) is a very poor hash function for constants (e.g. `int32_t`). It also tried to access individual tensor bytes through `tensor.data()` of size `AllocatedBytes()`. This led to ASAN failures because the `AllocatedBytes()` is an estimate of total bytes allocated by a tensor, including any pointed-to constructs (e.g. strings), and does not refer to contiguous bytes in the `.data()` buffer. We couldn't use this byte vector anyways, since types like `tstring` include pointers, whereas we need to hash the string values themselves. Modified the hash function to more closely mirror the `==` operator. This correctly handles `tstring` and any numeric types that do have contiguous storage. Other types are currently left as unimplemented. PiperOrigin-RevId: 446265413
mihaimaruseac
approved these changes
May 8, 2022
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Refer to the original commit: 1b85a28