[relay][onnx]KeyError: ‘ ’

When i load RNN onnx mode to relay, i have following error:
input.1
{‘input.1’: (10, 1, 1), ‘hidden’: (1, 1, 32)}
hidden
{‘input.1’: (10, 1, 1), ‘hidden’: (1, 1, 32)}
Traceback (most recent call last):
File “from_onnx.py”, line 97, in
sym, params = relay.frontend.from_onnx(onnx_model, shape_dict, dtype=‘float32’)
File “/tvm/python/tvm/relay/frontend/onnx.py”, line 1144, in from_onnx
sym, params = g.from_onnx(graph, opset)
File “/tvm/python/tvm/relay/frontend/onnx.py”, line 965, in from_onnx
inputs = [self._nodes[self._renames.get(i, i)] for i in node.input]
File “/tvm/python/tvm/relay/frontend/onnx.py”, line 965, in
inputs = [self._nodes[self._renames.get(i, i)] for i in node.input]
KeyError: ‘’