[BUGFIX] Fix search path for libtvm_topi.so (#4467)

python/tvm/_ffi/libinfo.py

@@ -90,7 +90,7 @@ def find_lib_path(name=None, search_path=None, optional=False):
 
     dll_path = [os.path.realpath(x) for x in dll_path]
     if search_path is not None:
-        if search_path is list:
+        if isinstance(search_path, list):
             dll_path = dll_path + search_path
         else:
             dll_path.append(search_path)
@@ -167,7 +167,7 @@ def find_include_path(name=None, search_path=None, optional=False):
 
     header_path = [os.path.abspath(x) for x in header_path]
     if search_path is not None:
-        if search_path is list:
+        if isinstance(search_path, list):
             header_path = header_path + search_path
         else:
             header_path.append(search_path)

topi/python/topi/cpp/impl.py

@@ -32,7 +32,7 @@ def _get_lib_names():
 def _load_lib():
     """Load libary by searching possible path."""
     curr_path = os.path.dirname(os.path.realpath(os.path.expanduser(__file__)))
-    lib_search = curr_path
+    lib_search = [curr_path, os.path.dirname(curr_path)]
     lib_path = libinfo.find_lib_path(_get_lib_names(), lib_search, optional=True)
     if lib_path is None:
         return None, None