Store instruction annotation values as C++ doubles.
#366
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* Factor out the per-instruction add to graph logic. * This change is in preparation for further changes to the graph construction logic. * Specifically, this should make the trace graph construction logic cleaner.
* Move annotation adding logic to `AddInstructionAnnotations`. * Remove default annotation magic number.
* Instruction annotations are currently stored as `float`s in the C++ parts of the codebase. * This matches the type currently used by the models (`tf.dtypes.float32`), but not the proto storage type (`double`). * For consistency, store annotations as `double`s at the C++ end, then cast them to whatever type the models require.
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boomanaiden154
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What's the benefit of doing the narrowing to float later versus earlier? It doesn't seem like this patch really enables anything and it will increase memory consumption.
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floats in the C++ graph builder.tf.dtypes.float32), but not the proto storage type (double).doubles at the C++ end, then narrow down to the type the models use.