Add CUDA 7.5 and 8.0 Dockerfiles (#4114)

* Add CUDA 7.5 and 8.0 Dockerfiles

* Use ~/mxnet as the workdir, set PYTHONPATH in dockerfile

docker/cuda/7.5/Dockerfile

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+FROM nvidia/cuda:7.5-cudnn5-devel
+MAINTAINER Qingsong Liu <liuqs.ustc@gmail.com>
+
+RUN apt-get update && apt-get install -y \
+  git \
+  libopenblas-dev \
+  libopencv-dev \
+  python-dev \
+  python-numpy \
+  python-setuptools \
+  wget \
+  python-pip \
+  unzip
+
+RUN cd /root && git clone --recursive https://github.com/dmlc/mxnet && cd mxnet && \
+  cp make/config.mk . && \
+  sed -i 's/USE_BLAS = atlas/USE_BLAS = openblas/g' config.mk && \
+  sed -i 's/USE_CUDA = 0/USE_CUDA = 1/g' config.mk && \
+  sed -i 's/USE_CUDA_PATH = NONE/USE_CUDA_PATH = \/usr\/local\/cuda/g' config.mk && \
+  sed -i 's/USE_CUDNN = 0/USE_CUDNN = 1/g' config.mk && \
+  make -j"$(nproc)"
+
+ENV PYTHONPATH /root/mxnet/python
+
+WORKDIR /root/mxnet

docker/cuda/8.0/Dockerfile

@@ -0,0 +1,25 @@
+FROM nvidia/cuda:8.0-cudnn5-devel
+MAINTAINER Qingsong Liu <liuqs.ustc@gmail.com>
+
+RUN apt-get update && apt-get install -y \
+  git \
+  libopenblas-dev \
+  libopencv-dev \
+  python-dev \
+  python-numpy \
+  python-setuptools \
+  wget \
+  python-pip \
+  unzip
+
+RUN cd /root && git clone --recursive https://github.com/dmlc/mxnet && cd mxnet && \
+  cp make/config.mk . && \
+  sed -i 's/USE_BLAS = atlas/USE_BLAS = openblas/g' config.mk && \
+  sed -i 's/USE_CUDA = 0/USE_CUDA = 1/g' config.mk && \
+  sed -i 's/USE_CUDA_PATH = NONE/USE_CUDA_PATH = \/usr\/local\/cuda/g' config.mk && \
+  sed -i 's/USE_CUDNN = 0/USE_CUDNN = 1/g' config.mk && \
+  make -j"$(nproc)"
+
+ENV PYTHONPATH /root/mxnet/python
+
+WORKDIR /root/mxnet