Final Dockerfile syntax correction: ensure chmod +x is a standalone RUN command

Dockerfile

@@ -49,16 +49,35 @@ RUN . $CONDA_DIR/etc/profile.d/conda.sh && \
         torchaudio==2.3.1 \
         --index-url https://download.pytorch.org/whl/cu121
 
-# Install Transformer Engine using the pre-built wheel
+# Copy the pre-built Transformer Engine wheel into the container
 # Ensure the filename matches your actual wheel file.
-COPY ./transformer_engine.whl /tmp/
+COPY ./transformer_engine_torch-1.12.0+cu121-cp310-cp310-linux_x86_64.whl /tmp/
+
+# Install Transformer Engine using the pre-built wheel
 RUN . $CONDA_DIR/etc/profile.d/conda.sh && \
     conda activate cosmos-predict1 && \
-    pip install --no-cache-dir /tmp/transformer_engine.whl
+    pip install --no-cache-dir /tmp/transformer_engine_torch-1.12.0+cu121-cp310-cp310-linux_x86_64.whl
 
 # Make the start.sh script executable.
-# THIS MUST BE A SEPARATE RUN COMMAND.
+# THIS IS A STANDALONE RUN COMMAND.
 RUN chmod +x /app/start.sh
 
+# --- Verification Steps ---
+RUN echo "Verifying Python and Conda installations..."
+RUN python --version
+RUN conda env list
+RUN echo "Verifying PyTorch and CUDA availability..."
+RUN conda run -n cosmos-predict1 python <<EOF
+import torch
+print('PyTorch Version: ' + torch.__version__)
+print('CUDA Available: ' + str(torch.cuda.is_available()))
+if torch.cuda.is_available():
+    print('CUDA Device Name: ' + torch.cuda.get_device_name(0))
+else:
+    print('CUDA Device Name: N/A')
+EOF
+RUN [ $? -eq 0 ] || echo "PyTorch verification failed. Check dependencies in cosmos-predict1.yaml."
+# --- End Verification Steps ---
+
 # Set the default command to run when the container starts.
 CMD ["/app/start.sh"]