[RPC] Allow RPCServer to run without decorator (#257)

python/tvm/_ffi/base.py

@@ -35,12 +35,12 @@ def _load_lib():
     lib = ctypes.CDLL(lib_path[0], ctypes.RTLD_GLOBAL)
     # DMatrix functions
     lib.TVMGetLastError.restype = ctypes.c_char_p
-    return lib
+    return lib, os.path.basename(lib_path[0])
 
 # version number
 __version__ = libinfo.__version__
 # library instance of nnvm
-_LIB = _load_lib()
+_LIB, _LIB_NAME = _load_lib()
 # The FFI mode of TVM
 _FFI_MODE = os.environ.get("TVM_FFI", "auto")
 

python/tvm/exec/rpc_server.py

@@ -19,18 +19,25 @@ def main():
                         help='The end search port of the PRC')
     parser.add_argument('--with-executor', type=bool, default=False,
                         help="Whether to load executor runtime")
+    parser.add_argument('--load-libary', type=str, default="",
+                        help="Additional libary to load")
     args = parser.parse_args()
 
     logging.basicConfig(level=logging.INFO)
-
+    load_libary = args.load_libary.split(":")
+    curr_path = os.path.dirname(os.path.abspath(os.path.expanduser(__file__)))
+    apps_path = os.path.join(curr_path, "../../../apps/graph_executor/lib/")
+    libs = []
     if args.with_executor:
-        curr_path = os.path.dirname(os.path.abspath(os.path.expanduser(__file__)))
-        apps_path = os.path.join(curr_path, "../../../apps/graph_executor/lib/")
-        lib_path = find_lib_path('libtvm_graph_exec.so', apps_path)
-        lib = ctypes.CDLL(lib_path[0])
+        load_libary += ["libtvm_graph_exec.so"]
+    if load_libary:
+        for file_name in args.load_libary.split(":"):
+            file_name = find_lib_path(file_name, apps_path)[0]
+            libs.append(ctypes.CDLL(file_name, ctypes.RTLD_GLOBAL))
+            logging.info("Load additional libary %s", file_name)
 
     server = rpc.Server(args.host, args.port, args.port_end)
-    server.libs.append(lib)
+    server.libs += libs
     server.proc.join()
 
 if __name__ == "__main__":

python/tvm/tag.py

 """Tag class for TVM operators."""
-from decorator import decorate
+from ._ffi.base import _LIB_NAME
+try:
+    from decorator import decorate
+except ImportError as err_msg:
+    # Allow decorator to be missing in runtime
+    if _LIB_NAME != "libtvm_runtime.so":
+        raise err_msg
 
 class TagScope(object):
     """Tag scope object to set tag for operators, working as context