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diff --git a/chapters/appendix_c.adoc b/chapters/appendix_c.adoc new file mode 100644 index 0000000..9c67849 --- /dev/null +++ b/chapters/appendix_c.adoc @@ -0,0 +1,29 @@ +// +// This confidential and proprietary software may be used only as +// authorised by a licensing agreement from ARM Limited +// (C) COPYRIGHT 2024 ARM Limited +// ALL RIGHTS RESERVED +// The entire notice above must be reproduced on all authorised +// copies and copies may only be made to the extent permitted +// by a licensing agreement from ARM Limited. + +== Appendix C - Rationale + +This appendix documents the rationale behind decisions made while creating the TOSA specification. +Explanations and definitions contained in this appendix are non-normative. + +=== FP8 + +The operators that perform calculations on FP8 data types are limited. +Fewer mantissa bits in FP8 make it inappropriate for use in most elementwise operations such as <<ADD>>. +Support was also added to the data layout and movement operations on the understanding that no calculations are performed. +Two extensions for the FP8 types were created in order to cover both formats defined by <<OCP-OFP8,OCP-OFP8>>. + +=== Transcendental Functions + +In the TOSA specification, a limited number of transcendental operations are supported. +The operators supported are sufficient for common networks while minimizing the number of operations an implementation must support. +Originally, SIGMOID and TANH were added as the common functions used for activations. +ERF was added to support GELU style activation functions. +SIN and COS were added to provide a base level of trigonometric functionality as well as support for Rotary Position Embedding. + |