Fix np.object for TYPE_STRING (triton-inference-server#31)

Co-authored-by: francescoclarifai <[email protected]>

Author: Tabrizian

src/resources/startup.py

@@ -305,7 +305,7 @@ def Execute(self, request, context):
                 output_shape = output_np_array.shape
 
                 # We need to serialize TYPE_STRING
-                if output_np_array.dtype.type is np.object or output_np_array.dtype.type is np.bytes_:
+                if output_np_array.dtype == np.object or output_np_array.dtype.type is np.bytes_:
                     output_np_array = serialize_byte_tensor(output_np_array)
 
                 tensor = Tensor(name=output_tensor.name(),