[setup] removed the build dependency on colossalai (#2307)

op_builder/utils.py

@@ -0,0 +1,20 @@
+import subprocess
+
+
+def get_cuda_bare_metal_version(cuda_dir):
+    raw_output = subprocess.check_output([cuda_dir + "/bin/nvcc", "-V"], universal_newlines=True)
+    output = raw_output.split()
+    release_idx = output.index("release") + 1
+    release = output[release_idx].split(".")
+    bare_metal_major = release[0]
+    bare_metal_minor = release[1][0]
+
+    return raw_output, bare_metal_major, bare_metal_minor
+
+
+def append_nvcc_threads(nvcc_extra_args):
+    from torch.utils.cpp_extension import CUDA_HOME
+    _, bare_metal_major, bare_metal_minor = get_cuda_bare_metal_version(CUDA_HOME)
+    if int(bare_metal_major) >= 11 and int(bare_metal_minor) >= 2:
+        return nvcc_extra_args + ["--threads", "4"]
+    return nvcc_extra_args