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//===- TensorSpec.h - type descriptor for a tensor --------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
#ifndef LLVM_ANALYSIS_TENSORSPEC_H
#define LLVM_ANALYSIS_TENSORSPEC_H
#include "llvm/Config/llvm-config.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/IR/LLVMContext.h"
#include <memory>
#include <optional>
#include <vector>
namespace llvm {
namespace json {
class OStream;
class Value;
} // namespace json
/// TensorSpec encapsulates the specification of a tensor: its dimensions, or
/// "shape" (row-major), its type (see TensorSpec::getDataType specializations
/// for supported types), its name and port (see "TensorFlow: Large-Scale
/// Machine Learning on Heterogeneous Distributed Systems", section 4.2, para 2:
/// https://static.googleusercontent.com/media/research.google.com/en//pubs/archive/45166.pdf)
///
/// Note that the design is motivated by Tensorflow, but it is not intended to
/// be Tensorflow-specific.
///
/// Known tensor types. The left part is the C type, the
/// right is a name we can use to identify the type (to implement TensorSpec
/// equality checks), and to use, if needed, when mapping to an underlying
/// evaluator's type system. The main requirement is that the C type we use has
/// the same size and encoding (e.g. endian-ness) as the one used by the
/// evaluator.
#define SUPPORTED_TENSOR_TYPES(M) \
M(float, Float) \
M(double, Double) \
M(int8_t, Int8) \
M(uint8_t, UInt8) \
M(int16_t, Int16) \
M(uint16_t, UInt16) \
M(int32_t, Int32) \
M(uint32_t, UInt32) \
M(int64_t, Int64) \
M(uint64_t, UInt64)
enum class TensorType {
Invalid,
#define _TENSOR_TYPE_ENUM_MEMBERS(_, Name) Name,
SUPPORTED_TENSOR_TYPES(_TENSOR_TYPE_ENUM_MEMBERS)
#undef _TENSOR_TYPE_ENUM_MEMBERS
Total
};
class TensorSpec final {
public:
template <typename T>
static TensorSpec createSpec(const std::string &Name,
const std::vector<int64_t> &Shape,
int Port = 0) {
return TensorSpec(Name, Port, getDataType<T>(), sizeof(T), Shape);
}
const std::string &name() const { return Name; }
int port() const { return Port; }
TensorType type() const { return Type; }
const std::vector<int64_t> &shape() const { return Shape; }
bool operator==(const TensorSpec &Other) const {
return Name == Other.Name && Port == Other.Port && Type == Other.Type &&
Shape == Other.Shape;
}
bool operator!=(const TensorSpec &Other) const { return !(*this == Other); }
/// Get the number of elements in a tensor with this shape.
size_t getElementCount() const { return ElementCount; }
/// Get the size, in bytes, of one element.
size_t getElementByteSize() const { return ElementSize; }
/// Get the total size of a memory buffer needed to store the whole tensor.
size_t getTotalTensorBufferSize() const { return ElementCount * ElementSize; }
template <typename T> bool isElementType() const {
return getDataType<T>() == Type;
}
TensorSpec(const std::string &NewName, const TensorSpec &Other)
: TensorSpec(NewName, Other.Port, Other.Type, Other.ElementSize,
Other.Shape) {}
void toJSON(json::OStream &OS) const;
private:
TensorSpec(const std::string &Name, int Port, TensorType Type,
size_t ElementSize, const std::vector<int64_t> &Shape);
template <typename T> static TensorType getDataType();
std::string Name;
int Port = 0;
TensorType Type = TensorType::Invalid;
std::vector<int64_t> Shape;
size_t ElementCount = 0;
size_t ElementSize = 0;
};
/// For debugging.
std::string tensorValueToString(const char *Buffer, const TensorSpec &Spec);
/// Construct a TensorSpec from a JSON dictionary of the form:
/// { "name": <string>,
/// "port": <int>,
/// "type": <string. Use LLVM's types, e.g. float, double, int64_t>,
/// "shape": <array of ints> }
/// For the "type" field, see the C++ primitive types used in
/// TFUTILS_SUPPORTED_TYPES.
std::optional<TensorSpec> getTensorSpecFromJSON(LLVMContext &Ctx,
const json::Value &Value);
#define TFUTILS_GETDATATYPE_DEF(T, Name) \
template <> TensorType TensorSpec::getDataType<T>();
SUPPORTED_TENSOR_TYPES(TFUTILS_GETDATATYPE_DEF)
#undef TFUTILS_GETDATATYPE_DEF
} // namespace llvm
#endif // LLVM_ANALYSIS_TENSORSPEC_H
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