update Dockerfile not to use requirements.txt

Dockerfile

@@ -20,19 +20,17 @@ RUN curl -o ~/miniconda.sh -O  https://repo.continuum.io/miniconda/Miniconda3-4.
      ~/miniconda.sh -b -p /opt/conda && \     
      rm ~/miniconda.sh && \
      /opt/conda/bin/conda install conda-build && \
-     /opt/conda/bin/conda create -y --name pytorch-py35 python=3.5.2 numpy scipy ipython mkl&& \
+     /opt/conda/bin/conda create -y --name pytorch-py35 python=3.5.2 numpy pyyaml scipy ipython mkl&& \
      /opt/conda/bin/conda clean -ya 
 ENV PATH /opt/conda/envs/pytorch-py35/bin:$PATH
 RUN conda install --name pytorch-py35 -c soumith magma-cuda80
 # This must be done before pip so that requirements.txt is available
 WORKDIR /opt/pytorch
 COPY . .
 
-RUN cat requirements.txt | xargs -n1 pip install --no-cache-dir && \
-    TORCH_CUDA_ARCH_LIST="3.5 5.2 6.0 6.1+PTX" TORCH_NVCC_FLAGS="-Xfatbin -compress-all" \
-    CMAKE_LIBRARY_PATH=/opt/conda/envs/pytorch-py35/lib \
-    CMAKE_INCLUDE_PATH=/opt/conda/envs/pytorch-py35/include \
-    pip install -v .
+RUN TORCH_CUDA_ARCH_LIST="3.5 5.2 6.0 6.1+PTX" TORCH_NVCC_FLAGS="-Xfatbin -compress-all" \
+    CMAKE_PREFIX_PATH="$(dirname $(which conda))/../" \
+    python setup.py install
 
 WORKDIR /workspace
 RUN chmod -R a+w /workspace