build multi arch

src/paddle_ocr/README.md

@@ -126,7 +126,7 @@ docker buildx build -f Dockerfile.cpu \
   --push .
 ```
 
-### GPU Image (x86_64 only)
+### GPU Image (x86_64 + ARM64 with local wheel)
 
 ```bash
 docker build -f Dockerfile.gpu -t paddle-ocr-api:gpu .
@@ -174,7 +174,7 @@ This section documents GPU support findings based on testing on an NVIDIA DGX Sp
 
 ### PaddlePaddle GPU Platform Support
 
-**Critical Finding:** PaddlePaddle-GPU does **NOT** support ARM64/aarch64 architecture.
+**Note:** PaddlePaddle-GPU does NOT have prebuilt ARM64 wheels on PyPI, but ARM64 support is available via custom-built wheels.
 
 | Platform | CPU | GPU |
 |----------|-----|-----|
@@ -182,21 +182,22 @@ This section documents GPU support findings based on testing on an NVIDIA DGX Sp
 | Windows x64 | ✅ | ✅ CUDA 10.2/11.x/12.x |
 | macOS x64 | ✅ | ❌ |
 | macOS ARM64 (M1/M2) | ✅ | ❌ |
-| Linux ARM64 (Jetson/DGX) | ✅ | ❌ No wheels |
+| Linux ARM64 (Jetson/DGX) | ✅ | ✅ Custom wheel required |
 
-**Source:** [PaddlePaddle-GPU PyPI](https://pypi.org/project/paddlepaddle-gpu/) - only `manylinux_x86_64` and `win_amd64` wheels available.
+**Source:** [PaddlePaddle-GPU PyPI](https://pypi.org/project/paddlepaddle-gpu/) - only `manylinux_x86_64` and `win_amd64` wheels available on PyPI. ARM64 wheels must be built from source or downloaded from Gitea packages.
 
-### Why GPU Doesn't Work on ARM64
+### ARM64 GPU Support
 
-1. **No prebuilt wheels**: `pip install paddlepaddle-gpu` fails on ARM64 - no compatible wheels exist
-2. **Not a CUDA issue**: The NVIDIA CUDA base images work fine on ARM64 (`nvidia/cuda:12.4.1-cudnn-runtime-ubuntu22.04`)
-3. **Not a container toolkit issue**: `nvidia-container-toolkit` is installed and functional
-4. **PaddlePaddle limitation**: The Paddle team hasn't compiled GPU wheels for ARM64
+ARM64 GPU support is available but requires custom-built wheels:
 
-When you run `pip install paddlepaddle-gpu` on ARM64:
-```
-ERROR: No matching distribution found for paddlepaddle-gpu
-```
+1. **No prebuilt PyPI wheels**: `pip install paddlepaddle-gpu` fails on ARM64 - no compatible wheels exist on PyPI
+2. **Custom wheels work**: This project provides Dockerfiles to build ARM64 GPU wheels from source
+3. **CI/CD builds ARM64 GPU images**: Pre-built wheels are available from Gitea packages
+
+**To use GPU on ARM64:**
+- Use the pre-built images from the container registry, or
+- Build the wheel locally using `Dockerfile.build-paddle` (see Option 2 below), or
+- Download the wheel from Gitea packages: `wheels/paddlepaddle_gpu-3.0.0-cp311-cp311-linux_aarch64.whl`
 
 ### Options for ARM64 Systems