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Dispatch.h
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Dispatch.h
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#pragma once
#include <ATen/core/Tensor.h>
#include <c10/macros/Macros.h>
#include <c10/util/Half.h>
#include <c10/util/Exception.h>
#include <ATen/core/DeprecatedTypeProperties.h>
#define AT_PRIVATE_CASE_TYPE(enum_type, type, ...) \
case enum_type: { \
using scalar_t = type; \
return __VA_ARGS__(); \
}
#define AT_QINT_PRIVATE_CASE_TYPE(enum_type, type, underlying_enum, underlying_type, ...) \
case enum_type: { \
const auto& UNDERLYING_TYPE C10_UNUSED = underlying_enum; \
using scalar_t C10_UNUSED = type; \
using underlying_t C10_UNUSED = underlying_type; \
return __VA_ARGS__(); \
}
namespace detail {
inline at::ScalarType scalar_type(at::ScalarType s) {
return s;
}
C10_DEPRECATED_MESSAGE("passing at::DeprecatedTypeProperties to an AT_DISPATCH macro is deprecated, " \
"pass an at::ScalarType instead")
inline at::ScalarType scalar_type(const at::DeprecatedTypeProperties &t) {
return t.scalarType();
}
C10_DEPRECATED_MESSAGE("AT_DISPATCH_ALL_TYPES_AND_HALF is deprecated, " \
"use AT_DISPATCH_ALL_TYPES_AND(at::ScalarType::Half, ...) instead")
inline void deprecated_AT_DISPATCH_ALL_TYPES_AND_HALF() {}
C10_DEPRECATED_MESSAGE("AT_DISPATCH_ALL_TYPES_AND_HALF_AND_COMPLEX is deprecated, " \
"use AT_DISPATCH_ALL_TYPES_AND_COMPLEX_AND(at::ScalarType::Half, ...) " \
"instead")
inline void deprecated_AT_DISPATCH_ALL_TYPES_AND_HALF_AND_COMPLEX() {}
}
// The AT_DISPATCH_* family of macros provides the ability to
// conveniently generate specializations of a kernel over all of the
// dtypes we care about in PyTorch. We call it "dispatch" because
// we are "dispatching" to the correct, dtype-specific kernel.
//
// A standard usage looks like:
//
// AT_DISPATCH_ALL_TYPES(self.scalar_type(), "op_name", [&] {
// // Your code here, with 'scalar_t' now defined to
// // be the dtype in question
// })
//
// There are many variations of this macro, so it's important to
// understand exactly /which/ dtypes you want to get instantiated, as
// well as what the "default" set is.
//
// The default set of dtypes that are instantiated (e.g., by
// AT_DISPATCH_ALL_TYPES) are floating point types (float, double),
// and integral types (int32_t, int64_t, int16_t, int8_t, uint8_t),
// but NOT booleans (bool), half-precision floats (Half) or
// complex number (std::complex<float>, std::complex<double>).
// This "cut" is somewhat historical (the default types are the
// ones that TH historically supported), but it also reflects the
// fact that the non-default types are "poorly" behaved (booleans
// are NOT integers mod 2, half precision operations ~essentially
// don't exist on CPU, complex numbers are an experimental application).
//
// Here are the questions you should generally ask to decide which
// dispatch you want:
//
// 1. Is this an integral or floating point specific operation?
// (If so, you'll want one of the FLOATING or INTEGRAL macros.)
//
// 2. Should half be supported? (If you're on CPU, the answer is almost
// definitely no. If you do want support, use one of the AND_HALF
// macros)
//
// Much rarer situations:
//
// 3. Should bool be supported? (You often have to write your kernel
// differently if arithmetic operations are involved.) If so,
// Use AT_DISPATCH_ALL_TYPES_AND along with ScalarType::Bool
//
// 4. Should complex be supported? The answer is almost always no,
// unless you are working on "generic" code that should work on
// all dtypes.
// NB: the the_type variable is not used, but we have kept it for
// backwards compatibility. It's probably not used by anyone though;
// but we're just being safe (and it doesn't hurt.) Note we must
// use it to shut up warnings about unused store.
#define AT_DISPATCH_FLOATING_TYPES(TYPE, NAME, ...) \
[&] { \
const auto& the_type = TYPE; \
/* don't use TYPE again in case it is an expensive or side-effect op */ \
at::ScalarType _st = ::detail::scalar_type(the_type); \
switch (_st) { \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Double, double, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Float, float, __VA_ARGS__) \
default: \
AT_ERROR(#NAME, " not implemented for '", toString(_st), "'"); \
} \
}()
#define AT_DISPATCH_FLOATING_TYPES_AND_HALF(TYPE, NAME, ...) \
[&] { \
const auto& the_type = TYPE; \
/* don't use TYPE again in case it is an expensive or side-effect op */ \
at::ScalarType _st = ::detail::scalar_type(the_type); \
switch (_st) { \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Double, double, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Float, float, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Half, at::Half, __VA_ARGS__) \
default: \
AT_ERROR(#NAME, " not implemented for '", toString(_st), "'"); \
} \
}()
#define AT_DISPATCH_FLOATING_TYPES_AND(SCALARTYPE, TYPE, NAME, ...) \
[&] { \
const auto& the_type = TYPE; \
/* don't use TYPE again in case it is an expensive or side-effect op */ \
at::ScalarType _st = ::detail::scalar_type(the_type); \
switch (_st) { \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Double, double, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Float, float, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(SCALARTYPE, \
decltype(c10::impl::ScalarTypeToCPPType<SCALARTYPE>::t), __VA_ARGS__) \
default: \
AT_ERROR(#NAME, " not implemented for '", toString(TYPE), "'"); \
} \
}()
#define AT_DISPATCH_FLOATING_AND_COMPLEX_TYPES(TYPE, NAME, ...) \
[&] { \
const auto& the_type = TYPE; \
/* don't use TYPE again in case it is an expensive or side-effect op */ \
at::ScalarType _st = ::detail::scalar_type(the_type); \
switch (_st) { \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Double, double, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Float, float, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Half, at::Half, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::ComplexDouble, std::complex<double>, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::ComplexFloat, std::complex<float>, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::ComplexHalf, std::complex<at::Half>, __VA_ARGS__) \
default: \
AT_ERROR(#NAME, " not implemented for '", toString(_st), "'"); \
} \
}()
#define AT_DISPATCH_INTEGRAL_TYPES(TYPE, NAME, ...) \
[&] { \
const auto& the_type = TYPE; \
/* don't use TYPE again in case it is an expensive or side-effect op */ \
at::ScalarType _st = ::detail::scalar_type(the_type); \
switch (_st) { \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Byte, uint8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Char, int8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Int, int32_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Long, int64_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Short, int16_t, __VA_ARGS__) \
default: \
AT_ERROR(#NAME, " not implemented for '", toString(_st), "'"); \
} \
}()
#define AT_DISPATCH_ALL_TYPES(TYPE, NAME, ...) \
[&] { \
const auto& the_type = TYPE; \
/* don't use TYPE again in case it is an expensive or side-effect op */ \
at::ScalarType _st = ::detail::scalar_type(the_type); \
switch (_st) { \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Byte, uint8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Char, int8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Double, double, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Float, float, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Int, int32_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Long, int64_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Short, int16_t, __VA_ARGS__) \
default: \
AT_ERROR(#NAME, " not implemented for '", toString(_st), "'"); \
} \
}()
#define AT_DISPATCH_COMPLEX_TYPES(TYPE, NAME, ...) \
[&] { \
const auto& the_type = TYPE; \
/* don't use TYPE again in case it is an expensive or side-effect op */ \
at::ScalarType _st = ::detail::scalar_type(the_type); \
switch (_st) { \
AT_PRIVATE_CASE_TYPE(at::ScalarType::ComplexFloat, std::complex<float>, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::ComplexDouble, std::complex<double>, __VA_ARGS__) \
default: \
AT_ERROR(#NAME, " not implemented for '", toString(_st), "'"); \
} \
}()
#define AT_DISPATCH_QINT_TYPES(TYPE, NAME, ...) \
[&] { \
const auto& SCALAR_TYPE C10_UNUSED = TYPE; \
switch (TYPE) { \
AT_QINT_PRIVATE_CASE_TYPE( \
at::kQInt8, at::qint8, at::kChar, int8_t, __VA_ARGS__) \
AT_QINT_PRIVATE_CASE_TYPE( \
at::kQUInt8, at::quint8, at::kByte, uint8_t, __VA_ARGS__) \
AT_QINT_PRIVATE_CASE_TYPE( \
at::kQInt32, at::qint32, at::kInt, int, __VA_ARGS__) \
default: \
AT_ERROR(#NAME, " not implemented for '", toString(TYPE), "'"); \
} \
}()
#define AT_DISPATCH_ALL_TYPES_AND_COMPLEX(TYPE, NAME, ...) \
[&] { \
const auto& the_type = TYPE; \
/* don't use TYPE again in case it is an expensive or side-effect op*/ \
at::ScalarType _st = ::detail::scalar_type(the_type); \
switch (_st) { \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Byte, uint8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Char, int8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Double, double, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Float, float, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Int, int32_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Long, int64_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Short, int16_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::ComplexFloat, std::complex<float>, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::ComplexDouble, std::complex<double>, __VA_ARGS__) \
default: \
AT_ERROR(#NAME, " not implemented for '", toString(_st), "'"); \
} \
}()
#define AT_DISPATCH_ALL_TYPES_AND(SCALARTYPE, TYPE, NAME, ...) \
[&] { \
switch (TYPE) { \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Byte, uint8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Char, int8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Double, double, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Float, float, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Int, int32_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Long, int64_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Short, int16_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(SCALARTYPE, decltype(c10::impl::ScalarTypeToCPPType<SCALARTYPE>::t), __VA_ARGS__) \
default: \
AT_ERROR(#NAME, " not implemented for '", toString(TYPE), "'"); \
} \
}()
#define AT_DISPATCH_ALL_TYPES_AND_COMPLEX_AND(SCALARTYPE, TYPE, NAME, ...) \
[&] { \
switch (TYPE) { \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Byte, uint8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Char, int8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Double, double, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Float, float, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Int, int32_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Long, int64_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Short, int16_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::ComplexFloat, std::complex<float>, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::ComplexDouble, std::complex<double>, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(SCALARTYPE, decltype(c10::impl::ScalarTypeToCPPType<SCALARTYPE>::t), __VA_ARGS__) \
default: \
AT_ERROR(#NAME, " not implemented for '", toString(TYPE), "'"); \
} \
}()
#define AT_DISPATCH_COMPLEX_TYPES_AND(SCALARTYPE, TYPE, NAME, ...) \
[&] { \
switch (TYPE) { \
AT_PRIVATE_CASE_TYPE(at::ScalarType::ComplexFloat, std::complex<float>, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::ComplexDouble, std::complex<double>, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(SCALARTYPE, decltype(c10::impl::ScalarTypeToCPPType<SCALARTYPE>::t), __VA_ARGS__) \
default: \
AT_ERROR(#NAME, " not implemented for '", toString(TYPE), "'"); \
} \
}()
#define AT_DISPATCH_ALL_TYPES_AND2(SCALARTYPE1, SCALARTYPE2, TYPE, NAME, ...) \
[&] { \
switch (TYPE) { \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Byte, uint8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Char, int8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Double, double, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Float, float, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Int, int32_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Long, int64_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Short, int16_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(SCALARTYPE1, decltype(c10::impl::ScalarTypeToCPPType<SCALARTYPE1>::t), __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(SCALARTYPE2, decltype(c10::impl::ScalarTypeToCPPType<SCALARTYPE2>::t), __VA_ARGS__) \
default: \
AT_ERROR(#NAME, " not implemented for '", toString(TYPE), "'"); \
} \
}()
#define AT_DISPATCH_ALL_TYPES_AND3(SCALARTYPE1, SCALARTYPE2, SCALARTYPE3, TYPE, NAME, ...) \
[&] { \
switch (TYPE) { \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Byte, uint8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Char, int8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Double, double, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Float, float, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Int, int32_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Long, int64_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Short, int16_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(SCALARTYPE1, decltype(c10::impl::ScalarTypeToCPPType<SCALARTYPE1>::t), __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(SCALARTYPE2, decltype(c10::impl::ScalarTypeToCPPType<SCALARTYPE2>::t), __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(SCALARTYPE3, decltype(c10::impl::ScalarTypeToCPPType<SCALARTYPE3>::t), __VA_ARGS__) \
default: \
AT_ERROR(#NAME, " not implemented for '", toString(TYPE), "'"); \
} \
}()
#define AT_DISPATCH_ALL_TYPES_AND_COMPLEX_AND3(SCALARTYPE1, SCALARTYPE2, SCALARTYPE3, TYPE, NAME, ...) \
[&] { \
switch (TYPE) { \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Byte, uint8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Char, int8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Double, double, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Float, float, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Int, int32_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Long, int64_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Short, int16_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::ComplexFloat, std::complex<float>, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::ComplexDouble, std::complex<double>, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(SCALARTYPE1, decltype(c10::impl::ScalarTypeToCPPType<SCALARTYPE1>::t), __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(SCALARTYPE2, decltype(c10::impl::ScalarTypeToCPPType<SCALARTYPE2>::t), __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(SCALARTYPE3, decltype(c10::impl::ScalarTypeToCPPType<SCALARTYPE3>::t), __VA_ARGS__) \
default: \
AT_ERROR(#NAME, " not implemented for '", TYPE, "'"); \
} \
}()
// ----------------------------------------------------------------------------
// DEPRECATED MACROS, DON'T USE THESE
// ----------------------------------------------------------------------------
#define AT_DISPATCH_ALL_TYPES_AND_HALF(TYPE, NAME, ...) \
[&] { \
detail::deprecated_AT_DISPATCH_ALL_TYPES_AND_HALF(); \
const auto& the_type = TYPE; \
/* don't use TYPE again in case it is an expensive or side-effect op */ \
at::ScalarType _st = ::detail::scalar_type(the_type); \
switch (_st) { \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Byte, uint8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Char, int8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Double, double, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Float, float, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Int, int32_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Long, int64_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Short, int16_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Half, at::Half, __VA_ARGS__) \
default: \
AT_ERROR(#NAME, " not implemented for '", toString(_st), "'"); \
} \
}()
#define AT_DISPATCH_ALL_TYPES_AND_HALF_AND_COMPLEX(TYPE, NAME, ...) \
[&] { \
detail::deprecated_AT_DISPATCH_ALL_TYPES_AND_HALF_AND_COMPLEX() \
const auto& the_type = TYPE; \
/* don't use TYPE again in case it is an expensive or side-effect op */ \
at::ScalarType _st = ::detail::scalar_type(the_type); \
switch (_st) { \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Byte, uint8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Char, int8_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Double, double, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Float, float, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Int, int32_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Long, int64_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Short, int16_t, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE(at::ScalarType::Half, at::Half, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE( \
at::ScalarType::ComplexFloat, std::complex<float>, __VA_ARGS__) \
AT_PRIVATE_CASE_TYPE( \
at::ScalarType::ComplexDouble, std::complex<double>, __VA_ARGS__) \
default: \
AT_ERROR(#NAME, " not implemented for '", toString(_st), "'"); \
} \
}()