reduction vulkan shader

[futz12]

No description provided.

[Copilot]

Pull request overview

This PR adds Vulkan compute shader support for the Reduction layer in the ncnn neural network framework. The implementation provides GPU-accelerated tensor reduction operations across various dimensions.

Key changes:

• Adds a new Vulkan compute shader (reduction.comp) that performs reduction operations (sum, mean, max, min, product, etc.) using shared memory and parallel reduction
• Implements the Reduction_vulkan class as a Vulkan backend for the Reduction layer
• Supports multiple reduction operations, multi-dimensional tensors (1D-4D), and configurable axis reduction with keepdims option

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/layer/vulkan/shader/reduction.comp	Vulkan compute shader implementing parallel reduction with support for 11 operation types and 1D-4D tensors
src/layer/vulkan/reduction_vulkan.h	Header file declaring the Reduction_vulkan class interface
src/layer/vulkan/reduction_vulkan.cpp	Implementation of Reduction_vulkan including pipeline creation and forward pass execution

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.26%. Comparing base (e5639d3) to head (1c3c3e1).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #6476       +/-   ##
===========================================
- Coverage   93.28%   93.26%    -0.03%     
===========================================
  Files         842      694      -148     
  Lines      265270   163497   -101773     
===========================================
- Hits       247450   152481    -94969     
+ Misses      17820    11016     -6804     

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[tencent-adm]

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1 out of 2 committers have signed the CLA.

✅ futz12
❌ nihui
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