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| Original file line number | Diff line number | Diff line change |
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| /*! | ||
| * Copyright (c) 2015 by Contributors | ||
| * \file static_operator.h | ||
| * \brief static operator interface of mxnet | ||
| */ | ||
| #ifndef MXNET_STATIC_OPERATOR_H_ | ||
| #define MXNET_STATIC_OPERATOR_H_ | ||
| // this file will be seen by cuda, no c++11 for now | ||
| #include <dmlc/base.h> | ||
| #include <vector> | ||
| #include "./base.h" | ||
| #include "./tensor_blob.h" | ||
|
|
||
| namespace mxnet { | ||
| /*! | ||
| * \brief static StaticOperator interface (current interface have not yet todo with scheduler), | ||
| * StaticOperator is a stateful object that can be used to call forward and backprop | ||
| * | ||
| * This interface relies on pre-allocated memory in TBlob, the caller need to set | ||
| * the memory region in TBlob correctly before calling Forward and Backward | ||
| * | ||
| * \sa TBlob, TShape | ||
| */ | ||
| class StaticOperator { | ||
| public: | ||
| /*! | ||
| * \brief get types of input argument of this oeprator | ||
| * \return a vector corresponding to type of each argument | ||
| * this order is same as the order of inputs in Forward, InferShape and Backward | ||
| */ | ||
| virtual std::vector<ArgType> DescribeArgs() const { | ||
| // default most of layers only have one data argument | ||
| return std::vector<ArgType>(1, kDataArg); | ||
| } | ||
| /*! | ||
| * \brief describe property of op | ||
| * \return a bit map in int | ||
| */ | ||
| virtual int DescribeProperty() const { | ||
| // default most of layer only conatin internal state | ||
| return kContainInteralState; | ||
| } | ||
| /*! | ||
| * \brief set param for the StaticOperator from string | ||
| * \param name parameter name | ||
| * \param val string for configuration | ||
| */ | ||
| virtual void SetParam(const char *name, const char *val) {} | ||
| /*! | ||
| * \brief inter the shapes of outputs and unknown input arguments | ||
| * \param in_shape the shape of input arguments of the StaticOperator | ||
| * this should be of same length as the vector returned by DescribeArgs | ||
| * in_shape allows unknown elements, which are checked by shape.ndim() == 0. | ||
| * For unknown shapes, InferShape will try to fill in the correct Shape in in_shape | ||
| * For known shapes, InferShape will check shape consistency | ||
| * | ||
| * common practice: set the shape of data input, and usually weight's shape can be infered | ||
| * | ||
| * \param out_shape the shape of outputs of the StaticOperator | ||
| * InferShape will modify the vector to fill output TShape | ||
| */ | ||
| virtual void InferShape(std::vector<TShape> *in_shape, | ||
| std::vector<TShape> *out_shape) = 0; | ||
| /*! | ||
| * \brief perform a forward operation of StaticOperator, save the output to TBlob | ||
| * \param opt option on Forward such as whether this is training phase | ||
| * \param ctx runtime context | ||
| * \param in_data array of input data, it is const | ||
| * \param out_data array of output data, | ||
| * the space of TBlob in out_data must be pre-allocated with InferShape | ||
| */ | ||
| virtual void Forward(Option opt, | ||
| RunContext ctx, | ||
| const std::vector<TBlob> &in_data, | ||
| const std::vector<TBlob> &out_data) = 0; | ||
| /*! | ||
| * \brief perform a backward operation of the StaticOperator to get the gradient | ||
| * \param ctx runtime context | ||
| * \param grad_next the gradient value we get from output of the StaticOperator | ||
| * \param in_data the array of input data | ||
| * \param out_grad array of output gradient, there could be three possible TBlob | ||
| * in the each element in the array | ||
| * \param req request types of the gradient saving operation | ||
| * only inplace will change input data | ||
| * \sa GradReqType | ||
| */ | ||
| virtual void Backward(RunContext ctx, | ||
| const std::vector<TBlob> &grad_next, | ||
| const std::vector<TBlob> &in_data, | ||
| const std::vector<TBlob> &out_grad, | ||
| const std::vector<GradReqType> &req) = 0; | ||
| /*! | ||
| * \brief factory unction, create a new StaticOperator | ||
| * \param type the type of StaticOperator | ||
| * \param ctx the context device type of StaticOperator | ||
| * \return a pointer of StaticOperator object | ||
| */ | ||
| static StaticOperator *Create(const char *type, Context ctx); | ||
| }; | ||
| } // namespace mxnet | ||
| #endif // MXNET_STATIC_OPERATOR_H_ |
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