Error converting ONNX to caffe2

[rracinskij]

Hi,

the conversion of the model to caffe2 via ONNX does not work with Pytorch 1.0.1. The initial script converts the model to ONNX, but the conversion to caffe2 fails, as
init_net, predict_net = c2.onnx_graph_to_caffe2_net(model)
results in the Segmentation fault (core dumped) error.

I aslo tried to adapt a script from https://pytorch.org/tutorials/advanced/super_resolution_with_caffe2.html :

import onnx
import caffe2.python.onnx.backend as onnx_caffe2_backend
from caffe2.python.predictor import mobile_exporter

model = onnx.load('models/mb1-ssd.onnx')
prepared_backend = onnx_caffe2_backend.prepare(model)
c2_workspace = prepared_backend.workspace
c2_model = prepared_backend.predict_net
init_net, predict_net = mobile_exporter.Export(c2_workspace, c2_model, c2_model.external_input)

but it also fails:

...anaconda3/lib/python3.6/site-packages/caffe2/python/predictor/mobile_exporter.py", line 41, in add_tensor
    kTypeNameMapper[blob.dtype],
KeyError: dtype('float64')

[qfgaohao]

Caffe2 is harder to use in the latest versions. I will move it to pytorch1.0 c++ backend if i have time.