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41 lines
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.. meta::
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:description: Composable Kernel documentation and API reference library
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:keywords: composable kernel, CK, ROCm, API, documentation
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.. _what-is-ck:
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********************************************************************
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What is the Composable Kernel library
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********************************************************************
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Methodology
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===========
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The Composable Kernel (CK) library provides a programming model for writing performance critical kernels for machine learning workloads across multiple architectures including GPUs and CPUs, through general purpose kernel languages like HIP C++.
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CK utilizes two concepts to achieve performance portability and code maintainability:
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* A tile-based programming model
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* Algorithm complexity reduction for complex ML operators using an innovative technique called
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"Tensor Coordinate Transformation".
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.. image:: ../data/ck_component.png
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:alt: CK Components
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Code Structure
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==============
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The CK library is structured into 4 layers:
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* "Templated Tile Operators" layer
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* "Templated Kernel and Invoker" layer
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* "Instantiated Kernel and Invoker" layer
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* "Client API" layer
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It also includes a simple wrapper component used to perform tensor transform operations more easily and with fewer lines of code.
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.. image:: ../data/ck_layer.png
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:alt: CK Layers
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