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affine_quantizer.cu
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affine_quantizer.cu
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#include <ATen/native/TensorIterator.h>
#include <ATen/native/quantized/affine_quantizer.h>
#include <math.h>
#include <ATen/cuda/CUDAApplyUtils.cuh>
#include <ATen/native/cuda/Loops.cuh>
namespace at {
namespace native {
namespace {
void quantize_tensor_per_tensor_affine_cuda(
Tensor rtensor,
Tensor qtensor,
double scale,
int64_t zero_point) {
AT_DISPATCH_QINT_TYPES(
qtensor.scalar_type(), "quantize_tensor_per_tensor_affine_cuda", [&]() {
constexpr int64_t qmin = std::numeric_limits<underlying_t>::min();
constexpr int64_t qmax = std::numeric_limits<underlying_t>::max();
auto iter = TensorIteratorConfig()
.check_all_same_dtype(false)
.add_output(qtensor)
.add_input(rtensor)
.add_input(qtensor)
.build();
gpu_kernel(
iter,
[=] GPU_LAMBDA(float raw_val, scalar_t quantized_val) -> scalar_t {
int64_t qvalue =
static_cast<int64_t>(nearbyint(raw_val / scale) + zero_point);
qvalue = std::max<int64_t>(qvalue, qmin);
qvalue = std::min<int64_t>(qvalue, qmax);
quantized_val.val_ = qvalue;
return quantized_val;
});
});
}
void dequantize_tensor_per_tensor_affine_cuda(
Tensor qtensor,
Tensor rtensor,
double scale,
int64_t zero_point) {
AT_DISPATCH_QINT_TYPES(
qtensor.scalar_type(), "dequantize_tensor_per_tensor_affine_cuda", [&]() {
auto iter = TensorIteratorConfig()
.check_all_same_dtype(false)
.add_output(rtensor)
.add_input(qtensor)
.build();
gpu_kernel(iter, [=] GPU_LAMBDA(scalar_t value) -> float {
return (static_cast<float>(value.val_) - zero_point) * scale;
});
});
}
} // anonymous namespace
REGISTER_DISPATCH(
quantize_tensor_per_tensor_affine_stub,
&quantize_tensor_per_tensor_affine_cuda);
REGISTER_DISPATCH(
dequantize_tensor_per_tensor_affine_stub,
&dequantize_tensor_per_tensor_affine_cuda);
} // namespace native
} // namespace at