[Inference/Refactor] Refactor compilation mechanism and unified multi hw (#5613)

* refactor compilation mechanism and unified multi hw

* fix file path bug

* add init.py to make pybind a module to avoid relative path error caused by softlink

* delete duplicated micros

* fix micros bug in gcc

extensions/pybind/moe/moe_cuda.py

@@ -0,0 +1,27 @@
+from ...cuda_extension import _CudaExtension
+from ...utils import append_nvcc_threads, get_cuda_cc_flag
+
+
+class MoeCudaExtension(_CudaExtension):
+    def __init__(self):
+        super().__init__(name="moe_cuda")
+
+    def sources_files(self):
+        ret = [self.csrc_abs_path(fname) for fname in ["kernel/cuda/moe_kernel.cu"]] + [
+            self.pybind_abs_path("moe/moe.cpp")
+        ]
+        return ret
+
+    def cxx_flags(self):
+        return ["-O3"] + self.version_dependent_macros
+
+    def nvcc_flags(self):
+        extra_cuda_flags = [
+            "-U__CUDA_NO_HALF_OPERATORS__",
+            "-U__CUDA_NO_HALF_CONVERSIONS__",
+            "--expt-relaxed-constexpr",
+            "--expt-extended-lambda",
+        ]
+        extra_cuda_flags.extend(get_cuda_cc_flag())
+        ret = ["-O3", "--use_fast_math"] + extra_cuda_flags + super().nvcc_flags()
+        return append_nvcc_threads(ret)