clean up the directory

hpvm/projects/onnx/frontend/graph_builder.py

hpvm/projects/onnx/frontend/graph_codegen.py

hpvm/projects/onnx/frontend/hpvm_codegen.py

hpvm/projects/onnx/frontend/keras_frontend/__init__.py

...cts/onnx/frontend/keras_frontend/approxhpvm_translator.py

...jects/onnx/frontend/keras_frontend/hpvm_dfg_translator.py

...ojects/onnx/frontend/keras_frontend/promise_translator.py

hpvm/projects/onnx/frontend/keras_frontend/quantize_utils.py

hpvm/projects/onnx/frontend/keras_frontend/util.py

hpvm/projects/onnx/frontend/keras_frontend/utils.py

hpvm/projects/onnx/frontend/keras_frontend/weight_utils.py

hpvm/projects/onnx/frontend/onnx_frontend/__init__.py

hpvm/projects/onnx/frontend/onnx_frontend/graph_builder.py

hpvm/projects/onnx/frontend/onnx_frontend/util.py

hpvm/projects/onnx/frontend/tensor.py

hpvm/projects/onnx/frontend/utils.py