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echo / code /flash-linear-attention /fla /ops /utils /constant.py

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Add Echo-Memory codebase used for this run (CC BY 4.0, JD Echo Team) (part 3)

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	# Copyright (c) 2023-2025, Songlin Yang, Yu Zhang

	# Approximate value of 1/ln(2), used for log/exp base conversion
	# Best FP32 approximation: 1.4426950216 (hex 0x3FB8AA3B)
	RCP_LN2 = 1.4426950216