[feat] refactored extension module (#5298)

* [feat] refactored extension module

* polish

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extensions/optimizer/__init__.py

@@ -0,0 +1,3 @@
+from .fused_optimizer_cuda import FusedOptimizerCudaExtension
+
+__all__ = ['FusedOptimizerCudaExtension']

extensions/optimizer/fused_optimizer_cuda.py

@@ -0,0 +1,34 @@
+from ..cuda_extension import _CudaExtension
+from ..utils import get_cuda_cc_flag
+
+
+class FusedOptimizerCudaExtension(_CudaExtension):
+    def __init__(self):
+        super().__init__(name="fused_optim_cuda")
+
+    def sources_files(self):
+        ret = [
+            self.csrc_abs_path(fname)
+            for fname in [
+                "cuda/colossal_C_frontend.cpp",
+                "cuda/multi_tensor_sgd_kernel.cu",
+                "cuda/multi_tensor_scale_kernel.cu",
+                "cuda/multi_tensor_adam.cu",
+                "cuda/multi_tensor_l2norm_kernel.cu",
+                "cuda/multi_tensor_lamb.cu",
+            ]
+        ]
+        return ret
+
+    def include_dirs(self):
+        ret = [self.get_cuda_home_include()]
+        return ret
+
+    def cxx_flags(self):
+        version_dependent_macros = ["-DVERSION_GE_1_1", "-DVERSION_GE_1_3", "-DVERSION_GE_1_5"]
+        return ["-O3"] + version_dependent_macros
+
+    def nvcc_flags(self):
+        extra_cuda_flags = ["-lineinfo"]
+        extra_cuda_flags.extend(get_cuda_cc_flag())
+        return ["-O3", "--use_fast_math"] + extra_cuda_flags