1 源码下载
Ascend对pytorch代码的适配,可从以下链接中获取。 Ascend/pytorch 执行如下命令即可。
bash
git clone https://gitee.com/ascend/pytorch.git
2 目录结构解析
源码下载后,如果需要编译torch-npu,最好保持pytorch的源码版本匹配,以及其编译环境的gcc,g++等与torch-npu的版本匹配,否则会出现各种乱起八糟的问题。
执行编译命令:bash ci/build.sh --python=3.x
如:
bash
csrc/aten/AutoCastOps.cpp:28:70: error: macro "KERNEL_PRIVATEUSEONE" passed 3 arguments, but takes just 2
KERNEL_PRIVATEUSEONE(_convolution, deprecated, lower_precision_fp)
在torch-npu编译成功之后,通过generate_code.sh会生成如下文件:
bash
torch_npu/csrc/aten/ADInplaceOrViewTypeEverything.cpp
torch_npu/csrc/aten/ADInplaceOrViewType_0.cpp
torch_npu/csrc/aten/ADInplaceOrViewType_1.cpp
torch_npu/csrc/aten/CustomFunctions.cpp
torch_npu/csrc/aten/CustomFunctions.h
torch_npu/csrc/aten/CustomRedispatch.cpp
torch_npu/csrc/aten/CustomRedispatch.h
torch_npu/csrc/aten/CustomRegisterSchema.cpp
torch_npu/csrc/aten/ForeachRegister.cpp
torch_npu/csrc/aten/Functions.cpp
torch_npu/csrc/aten/Functions.h
torch_npu/csrc/aten/NPUOpApiNativeFunctions.h
torch_npu/csrc/aten/QuantizedRegister.cpp
torch_npu/csrc/aten/RegisterFunctionalizationEverything.cpp
torch_npu/csrc/aten/RegisterFunctionalization_0.cpp
torch_npu/csrc/aten/RegisterFunctionalization_1.cpp
torch_npu/csrc/aten/RegisterSparseCsrNPU.cpp
torch_npu/csrc/aten/RegisterSparseNPU.cpp
torch_npu/csrc/aten/VariableType.h
torch_npu/csrc/aten/VariableTypeEverything.cpp
torch_npu/csrc/aten/VariableType_0.cpp
torch_npu/csrc/aten/npu_native_functions_by_codegen.yaml
torch_npu/csrc/aten/python_functions.h
torch_npu/csrc/aten/python_functionsEverything.cpp
torch_npu/csrc/aten/python_functions_0.cpp
torch_npu/csrc/aten/python_functions_1.cpp
torch_npu/csrc/aten/variable_factories.h
torch_npu/testing/_npu_testing_utils.py
torch_npu/utils/custom_ops.py
torch_npu/utils/exposed_api.py
上述文件生成路径默认的是torch_npu/csrc/aten。算子编译信息的yaml文件:torch_npu/csrc/aten/npu_native_functions.yaml
打开上述的的文件中,从中分析可知大概有3种方式实现昇腾npu算子的调用。
3. 算子注册方式
本质上,ascend上对pytroch框架的适配代码,主要是将npu上的算子库对接起来。如何对接这些算子,是一套机制的问题,本身应该不复杂。
3.1 通过torch的regsiter方式
直接调用npu的算子。torch_npu/csrc/aten/RegisterSparseNPU.cpp
cpp
TORCH_LIBRARY_IMPL(aten, SparsePrivateUse1, m) {
m.impl("abs", TORCH_FN(wrap_SparseNPU_abs_));
m.impl("abs_", TORCH_FN(wrap_SparseNPU_abs__));
m.impl("abs.out", TORCH_FN(wrap_SparseNPU_abs_out));
m.impl("sgn", TORCH_FN(wrap_SparseNPU_sgn_));
m.impl("sgn_", TORCH_FN(wrap_SparseNPU_sgn__));
m.impl("sgn.out", TORCH_FN(wrap_SparseNPU_sgn_out));
3.2 通过定义算子方式
参考文件:torch_npu/csrc/aten/CustomFunctions.cpp
cpp
#include <ATen/core/dispatch/Dispatcher.h>
#include "torch_npu/csrc/aten/CustomFunctions.h"
namespace at_npu {
namespace native {
namespace custom_ops {
int64_t npu_change_data_ptr(const at::Tensor & dst, const at::Tensor & src, int64_t index) {
static auto op = c10::Dispatcher::singleton().findSchemaOrThrow("npu::npu_change_data_ptr", "").typed<int64_t (const at::Tensor &, const at::Tensor &, int64_t)>();
return op.call(dst, src, index);
}
int64_t get_npu_format(const at::Tensor & self) {
static auto op = c10::Dispatcher::singleton().findSchemaOrThrow("npu::get_npu_format", "").typed<int64_t (const at::Tensor &)>();
return op.call(self);
}
at::Tensor npu_format_cast(const at::Tensor & self, const at::Tensor & dst) {
static auto op = c10::Dispatcher::singleton().findSchemaOrThrow("npu::npu_format_cast", "Tensor").typed<at::Tensor (const at::Tensor &, const at::Tensor &)>();
return op.call(self, dst);
}
at::Tensor & npu_format_cast_(at::Tensor & self, int64_t acl_format) {
static auto op = c10::Dispatcher::singleton().findSchemaOrThrow("npu::npu_format_cast_", "acl_format").typed<at::Tensor & (at::Tensor &, int64_t)>();
return op.call(self, acl_format);
at::Tensor & npu_format_cast_(at::Tensor & self, const at::Tensor & src) {
static auto op = c10::Dispatcher::singleton().findSchemaOrThrow("npu::npu_format_cast_", "").typed<at::Tensor & (at::Tensor &, const at::Tensor &)>();
return op.call(self, src);
}
at::Tensor empty_with_format(at::IntArrayRef size, ::std::optional<at::ScalarType> dtype, ::std::optional<at::Layout> layout, ::std::optional<at::Device> device, ::std::optional<bool> pin_memory, int64_t acl_format) {
static auto op = c10::Dispatcher::singleton().findSchemaOrThrow("npu::empty_with_format", "").typed<at::Tensor (at::IntArrayRef, ::std::optional<at::ScalarType>, ::std::optional<at::Layout>, ::std::optional<at::Device>, ::std::optional<bool>, int64_t)>();
return op.call(size, dtype, layout, device, pin_memory, acl_format);
}
at::Tensor unsafe_empty_with_format(at::IntArrayRef size, ::std::optional<at::ScalarType> dtype, ::std::optional<at::Layout> layout, ::std::optional<at::Device> device, ::std::optional<bool> pin_memory, int64_t acl_format, bool keep_format) {
static auto op = c10::Dispatcher::singleton().findSchemaOrThrow("npu::unsafe_empty_with_format", "").typed<at::Tensor (at::IntArrayRef, ::std::optional<at::ScalarType>, ::std::optional<at::Layout>, ::std::optional<at::Device>, ::std::optional<bool>, int64_t, bool)>();
return op.call(size, dtype, layout, device, pin_memory, acl_format, keep_format);
}
~/pytorch-ascend/torch_npu/csrc/aten/CustomFunctions.cpp[1,RO]
...
}
}
}
3.3 通过API重定向映射的方式
参考文件:torch_npu/utils/custom_ops.py
bash
torch_npu.npu_layer_norm_eval = torch.ops.npu.npu_layer_norm_eval
torch_npu.npu_fused_attention_score_grad = torch.ops.npu.npu_fused_attention_score_grad
torch_npu.npu_quant_conv2d = torch.ops.npu.npu_quant_conv2d
torch_npu.npu_view_copy = torch.ops.npu.npu_view_copy
torch_npu.npu_fast_gelu = torch.ops.npu.npu_fast_gelu
torch_npu.npu_fused_attention_layernorm_qkv_fwd = torch.ops.npu.npu_fused_attention_layernorm_qkv_fwd
torch_npu.npu_fast_gelu_backward = torch.ops.npu.npu_fast_gelu_backward
torch_npu.npu_bmm_v2_mat1_backward = torch.ops.npu.npu_bmm_v2_mat1_backward
以上属于个人理解,如有错误敬请指正。