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Converts a graphdef with LiteOp hints into stub operations.

This is used to prepare for toco conversion of complex intrinsic usages. Note: only one of session or graph_def should be used, not both.

session A TensorFlow session that contains the graph to convert.
graph_def A graph def that we should convert.
write_callback A function pointer that can be used to write intermediate steps of graph transformation (optional).

A new graphdef with all ops contained in OpHints being replaced by a single op call with the right parameters.

ValueError If both session and graph_def are provided.