: GHA: pin torch-2.9.0 (#1742)

Summary: Pull Request resolved: #1742

Differential Revision: D86052365

Author: shayne-fletcher

.github/workflows/build-cpu.yml

@@ -30,7 +30,7 @@ jobs:
         setup_build_environment
 
         # Install torch nightly (CPU version)
-        pip install --pre torch --index-url https://download.pytorch.org/whl/nightly/cpu
+        pip install torch==2.9.0+cpu --index-url https://download.pytorch.org/whl/cpu
         pip install -r build-requirements.txt
 
         # Build monarch (No tensor engine, CPU version)

.github/workflows/build-cuda.yml

@@ -17,7 +17,7 @@ jobs:
         include:
           - name: 4xlargegpu
             runs-on: linux.g5.4xlarge.nvidia.gpu
-            torch-spec: '--pre torch --index-url https://download.pytorch.org/whl/nightly/cu126'
+            torch-spec: 'torch==2.9.0+cu126 --index-url https://download.pytorch.org/whl/cu126'
             gpu-arch-type: "cuda"
             gpu-arch-version: "12.6"
     with:

.github/workflows/doc_build.yml

@@ -39,7 +39,7 @@ jobs:
         pip install -r docs/requirements.txt
 
         # Install PyTorch with CUDA support (matching build-cuda.yml)
-        pip install --pre torch --index-url https://download.pytorch.org/whl/nightly/cu126
+        pip install torch==2.9.0+cu126 --index-url https://download.pytorch.org/whl/cu126
 
         # Set environment variables for CUDA build
         export USE_CUDA=1