def test_output(self):
for opset_version in range(
onnx_chainer.MINIMUM_OPSET_VERSION,
onnx.defs.onnx_opset_version() + 1):
with self.assertRaises(RuntimeError):
onnx_chainer.export(
self.model, self.x, opset_version=opset_version)
def export_onnx(input_image_path, output_path, gpu, only_output=True):
"""Export ResNet50 model to ONNX graph
'model.onnx' file will be exported under ``output_path``.
"""
model = C.ResNet50(pretrained_model='imagenet', arch='fb')
input_image = read_image(input_image_path)
input_image = scale(input_image, 256)
input_image = center_crop(input_image, (224, 224))
input_image -= model.mean
input_image = input_image[None, :]
if gpu >= 0:
model.to_gpu()
input_image = chainer.cuda.to_gpu(input_image)
if only_output:
os.makedirs(output_path, exist_ok=True)
name = os.path.join(output_path, 'model.onnx')
export(model, input_image, filename=name)
else:
# an input and output given by Chainer will be also emitted
# for using as test dataset
export_testcase(model, input_image, output_path)
def main():
parser = argparse.ArgumentParser()
parser.add_argument('--model',
type=str,
required=True,
help='Model directory path.')
parser.add_argument('--out',
type=str,
required=True,
help='ONNX file output path.')
parser.add_argument('--gpu', type=int, default=0, help='GPU id.')
args = parser.parse_args()
# Predefined parameters.
n_actions = 4 # env.action_space.n
replay_start_size = 5 * 10**4
# Load the model.
q_func = links.Sequence(links.NatureDQNHead(), L.Linear(512, n_actions),
DiscreteActionValue)
opt = chainer.optimizers.RMSpropGraves(lr=2.5e-4,
alpha=0.95,
momentum=0.0,
eps=1e-2)
opt.setup(q_func)
rbuf = replay_buffer.ReplayBuffer(10**6)
explorer = explorers.LinearDecayEpsilonGreedy(
start_epsilon=1.0,
end_epsilon=0.1,
decay_steps=10**6,
random_action_func=lambda: np.random.randint(n_actions))
def phi(x):
# Feature extractor
return np.asarray(x, dtype=np.float32) / 255
Agent = agents.DQN
agent = Agent(q_func,
opt,
rbuf,
gpu=args.gpu,
gamma=0.99,
explorer=explorer,
replay_start_size=replay_start_size,
target_update_interval=10**4,
clip_delta=True,
update_interval=4,
batch_accumulator='sum',
phi=phi)
agent.load(args.model)
# Extract core links from the model and export these links as an ONNX format.
onnx_compat_model = convert_to_compatible_model(agent)
x = cp.array(np.zeros((1, 4, 84, 84), dtype=np.float32))
onnx_chainer.export(onnx_compat_model,
x,
input_names='input',
output_names='action',
return_named_inout=True,
filename=args.out)
def export_onnx(input_image_path, output_path, gpu, only_output=True):
"""Export YOLOv2 Tiny model to ONNX graph
'model.onnx' file will be exported under ``output_path``.
"""
model = YOLOv2Tiny(pretrained_model='voc0712')
input_image = read_image(input_image_path)
input_image = input_image[None, :]
if gpu >= 0:
model.to_gpu()
input_image = chainer.cuda.to_gpu(input_image)
if only_output:
os.makedirs(output_path, exist_ok=True)
name = os.path.join(output_path, 'model.onnx')
export(
model, input_image, filename=name,
output_names=('locs', 'objs', 'confs'))
else:
# an input and output given by Chainer will be also emitted
# for using as test dataset
export_testcase(
model, input_image, output_path,
output_names=('locs', 'objs', 'confs'))
def test_get_item_error(slices):
model = chainer.Sequential(
lambda x: F.get_item(x, slices=slices))
x = input_generator.increasing(2, 3, 4)
with pytest.raises(ValueError):
export(model, x)
def create_onnx_test(graph_name, model, inputs, builtins, out_dir):
# TODO(hamaji): Investigate why we need to set train=False for ResNet50.
chainer.config.train = False
makedirs(out_dir)
with replace_id(model, builtins):
onnx_chainer.export(model,
inputs,
filename='%s/model.onnx' % out_dir,
graph_name=graph_name)
onnx_extra_inputs = []
if hasattr(model, 'extra_inputs'):
onnx_extra_inputs = model.extra_inputs
test_data_dir = '%s/test_data_set_0' % out_dir
makedirs(test_data_dir)
for i, var in enumerate(list(inputs) + list(onnx_extra_inputs)):
with open(os.path.join(test_data_dir, 'input_%d.pb' % i), 'wb') as f:
t = numpy_helper.from_array(var.data, 'Input_%d' % i)
f.write(t.SerializeToString())
chainer.config.train = True
model.cleargrads()
result = model(*inputs)
result.grad = np.ones(result.shape, result.dtype)
result.backward()
outputs = [('', result.array)]
for name, param in model.namedparams():
outputs.append(('grad_out@' + name, param.grad))
for i, (name, value) in enumerate(outputs):
with open(os.path.join(test_data_dir, 'output_%d.pb' % i), 'wb') as f:
t = numpy_helper.from_array(value, name)
f.write(t.SerializeToString())
def test_compatibility(self):
chainer.config.train = False
with chainer.using_config('train', False):
chainer_out = self.model(self.x).array
onnx_chainer.export(self.model,
self.x,
self.fn,
opset_version=self.opset_version)
model_onnx = onnx.load(self.fn)
sym, params = nnvm.frontend.from_onnx(model_onnx)
target = 'llvm'
input_name = sym.list_input_names()[0]
shape_dict = {input_name: self.x.shape}
graph, lib, params = nnvm.compiler.build(sym,
target,
shape_dict,
params=params,
dtype={input_name: 'float32'})
module = tvm.contrib.graph_runtime.create(graph, lib, tvm.cpu(0))
module.set_input(input_name, tvm.nd.array(self.x))
module.set_input(**params)
module.run()
out_shape = (1, 1000)
output = tvm.nd.empty(out_shape, ctx=tvm.cpu(0))
nnvm_output = module.get_output(0, output).asnumpy()
np.testing.assert_almost_equal(chainer_out, nnvm_output, decimal=5)
os.remove(self.fn)
def main(logger):
parser = argparse.ArgumentParser()
parser.add_argument('--model')
parser.add_argument('--out', required=False)
args = parser.parse_args()
if args.out is None:
output_filename = args.model + ".onnx"
else:
output_filename = args.out
logger.info("Generating `{}` model and save it to `{}`".format(
args.model, output_filename))
try:
if args.model == 'and_op':
model = AND()
x = np.empty((1, 2), dtype=np.float32)
with chainer.using_config('train', False), \
mock.patch('builtins.id', IDGenerator()):
onnx_chainer.export(model, x, filename=output_filename)
elif args.model == 'mlp':
model = MLP()
x = np.empty((1, 3), dtype=np.float32)
with chainer.using_config('train', False), \
mock.patch('builtins.id', IDGenerator()):
onnx_chainer.export(model, x, filename=output_filename)
except Exception:
logger.exception("An error occurred during generation of the model")
def check_output(model, x):
with tempfile.NamedTemporaryFile('wb') as fp:
onnx_chainer.export(model, x, fp)
sym, params = onnx_mxnet.import_model(fp.name)
mod = mx.mod.Module(symbol=sym,
data_names=['input_0'],
context=mx.cpu(),
label_names=None)
mod.bind(for_training=False,
data_shapes=[('input_0', x.shape)],
label_shapes=None)
mod.set_params(arg_params=params, aux_params=None, allow_missing=True)
Batch = namedtuple('Batch', ['data'])
mod.forward(Batch([mx.nd.array(x)]))
mxnet_out = mod.get_outputs()[0].asnumpy()
y = model(x)
if isinstance(y, dict):
y = y['prob']
chainer_out = y.array
np.testing.assert_almost_equal(chainer_out, mxnet_out, decimal=5)
def main():
chainer.config.train = False
model = FastStyleNet()
serializers.load_npz(
'./chainer-fast-neuralstyle-models/models/starrynight.model', model)
input = './test1.jpg'
original = Image.open(input).convert('RGB')
print(original.size)
image = np.asarray(original, dtype=np.float32).transpose(2, 0, 1)
image = image.reshape((1, ) + image.shape)
padding = 0 #50
if padding > 0:
image = np.pad(
image, [[0, 0], [0, 0], [padding, padding], [padding, padding]],
'symmetric')
x = image
out = model(x)
out = out.data[0]
print(out.shape)
print('model done.')
postprocess(out)
print('export onnx...')
onnx_chainer.export(model, x, filename='FastStyleNet.onnx')
def test_compatibility(self):
if MXNET_OPSET_VERSION[self.name] is not None:
for mxnet_opset_version in MXNET_OPSET_VERSION[self.name]:
test_mxnet.check_compatibility(
self.model, self.x, self.fn, opset_version=mxnet_opset_version)
for opset_version in range(1, onnx.defs.onnx_opset_version() + 1):
onnx_chainer.export(self.model, self.x,
opset_version=opset_version)
def test_compatibility(self):
test_mxnet.check_compatibility(self.model,
self.x,
self.fn,
opset_version=self.opset_version)
onnx_chainer.export(self.model,
self.x,
opset_version=self.opset_version)
def test_compatibility(self):
test_mxnet.check_compatibility(self.model,
self.x,
self.fn,
opset_version=self.opset_version)
for opset_version in range(1, onnx.defs.onnx_opset_version() + 1):
onnx_chainer.export(self.model,
self.x,
opset_version=opset_version)
def main():
parser = argparse.ArgumentParser()
parser.add_argument('out')
args = parser.parse_args()
model = MLP()
x = np.empty((1, 3), dtype=np.float32)
with chainer.using_config('train', False), \
mock.patch('builtins.id', IDGenerator()):
onnx_chainer.export(model, x, filename=args.out)
def convert_model_to_onnx(input_shape, onnx_file_path):
# Export Chainer model to ONNX
model = L.VGG16(pretrained_model='imagenet')
# Pseudo input
x = np.zeros(input_shape, dtype=np.float32)
# Don't forget to set train flag off!
chainer.config.train = False
onnx_chainer.export(model, x, filename=onnx_file_path)
def main():
x = numpy.zeros((1, 3, 32, 32), dtype=numpy.float32)
# disable rename_tensors version
export(Model(use_bn=True), x, filename='output/A.onnx')
export(Model(use_bn=False), x, filename='output/B.onnx')
# disable check model in onnx_chainer.export
checker.check_model = lambda x: None
onnx_chainer.export(Model(use_bn=True), x, filename='output/C.onnx')
onnx_chainer.export(Model(use_bn=False), x, filename='output/D.onnx')
def predict(args):
classes = np.genfromtxt(os.path.join(args.dataset, "meta", "classes.txt"),
str,
delimiter="\n")
model, preprocess, xp, test_dataset = prepare_setting(args)
from chainer.exporters import caffe
import onnx_chainer
# x = [chainer.Variable(np.zeros((1, 3, 224, 224), np.float32))]
# caffe.export(model, x, None, True, 'test')
x = np.zeros((1, 3, 224, 224), dtype=np.float32)
onnx_chainer.export(model, x, filename='text.onnx')
top_1_counter = 0
top_5_counter = 0
top_10_counter = 0
indices = list(range(len(test_dataset)))
num_iteration = len(indices) if args.sample < 0 else args.sample
random.shuffle(indices)
with chainer.function.no_backprop_mode(), chainer.using_config(
'train', False):
for i in indices[:num_iteration]:
img, label = test_dataset.get_example(i)
h = model.predictor(xp.expand_dims(xp.array(img), axis=0))
print(xp.expand_dims(xp.array(img), axis=0).shape)
prediction = chainer.functions.softmax(h)
if args.device >= 0:
prediction = xp.asnumpy(prediction[0].data)
else:
prediction = prediction[0].data
top_ten = np.argsort(-prediction)[:10]
top_five = top_ten[:5]
if top_five[0] == label:
top_1_counter += 1
top_5_counter += 1
top_10_counter += 1
msg = "Bingo!"
elif label in top_five:
top_5_counter += 1
top_10_counter += 1
msg = "matched top 5"
elif label in top_ten:
top_10_counter += 1
msg = "matched top 10"
else:
msg = "Boo, actual {}".format(classes[label])
print(classes[top_five], prediction[top_five], msg)
print('top1 accuracy', top_1_counter / num_iteration)
print('top5 accuracy', top_5_counter / num_iteration)
print('top10 accuracy', top_10_counter / num_iteration)
def save_as_onnx_then_import_from_nnvm(model, fn):
# Prepare an input tensor
x = np.random.rand(1, 3, 224, 224).astype(np.float32) * 255
# Run the model on the data
with chainer.using_config('train', False):
chainer_out = model(x).array
# Export Chainer model into ONNX
onnx_chainer.export(model, x, fn)
# Load the saved ONNX file using ONNX module
model_onnx = onnx.load(fn)
# Convert the ONNX model object into NNVM symbol
sym, params = nnvm.frontend.from_onnx(model_onnx)
# Choose the compilation target
target = 'llvm'
# Extract the name of input variable in the ONNX graph
input_name = sym.list_input_names()[0]
shape_dict = {input_name: x.shape}
# Compile the model using NNVM
graph, lib, params = nnvm.compiler.build(sym,
target,
shape_dict,
params=params,
dtype={input_name: 'float32'})
# Convert the compiled model into TVM module
module = tvm.contrib.graph_runtime.create(graph, lib, tvm.cpu(0))
# Set the input tensor x
module.set_input(input_name, tvm.nd.array(x))
module.set_input(**params)
# Run the model
module.run()
# Retrieve the inference result
out_shape = (1, 1000)
output = tvm.nd.empty(out_shape, ctx=tvm.cpu(0))
nnvm_output = module.get_output(0, output).asnumpy()
# Check both outputs have same values
np.testing.assert_almost_equal(chainer_out, nnvm_output, decimal=5)
def gen_onnx_model(self, inputs):
import onnx_chainer
self.onnx_dir = self.model_dir
data_dir = os.path.join(self.onnx_dir, 'test_data_set_0')
utils.makedirs(data_dir)
onnx_filename = os.path.join(self.onnx_dir, 'model.onnx')
if self.is_up_to_date(onnx_filename):
return False
onnx_chainer.export(self.model,
list(inputs),
filename=onnx_filename + '.tmp',
graph_name=self.name)
return True
def export_onnx(args):
config = load_config(args)
model = MyModel(config)
chainer.serializers.load_npz(os.path.join(args.model, 'bestmodel.npz'),
model)
w, h = parse_size(config.get('model_param', 'insize'))
x = np.zeros((1, 3, h, w), dtype=np.float32)
logger.info('begin export')
output = os.path.join(args.model, 'bestmodel.onnx')
with chainer.using_config('train', False):
onnx_chainer.export(model, x, filename=output)
logger.info('end export')
logger.info('run onnx.check')
onnx_model = onnx.load(output)
onnx.checker.check_model(onnx_model)
logger.info('done')
def test_invalid_customized_input_shape(x_shape, shape_option):
model = chainer.Sequential(F.relu)
if isinstance(x_shape, tuple):
xs = np.zeros(x_shape, dtype=np.float32)
elif isinstance(x_shape, list):
xs = tuple(np.zeros(shape, dtype=np.float32) for shape in x_shape)
else:
assert isinstance(x_shape, dict)
xs = {
k: np.zeros(shape, dtype=np.float32)
for k, shape in x_shape.items()
}
with pytest.raises(ValueError):
export(model, xs, input_shapes=shape_option)
def save_as_onnx_then_import_from_mxnet(model, fn):
# Prepare an input tensor
x = np.random.rand(1, 3, 224, 224).astype(np.float32) * 255
# Run the model on the data
with chainer.using_config('train', False):
chainer_out = model(x).array
# Export Chainer model into ONNX
onnx_chainer.export(model, x, fn)
# Load ONNX model into MXNet symbol
sym, arg, aux = mxnet.contrib.onnx.import_model(fn)
# Find the name of input tensor
data_names = [
graph_input for graph_input in sym.list_inputs()
if graph_input not in arg and graph_input not in aux
]
data_shapes = [(data_names[0], x.shape)]
# Create MXNet model
mod = mxnet.mod.Module(symbol=sym,
data_names=data_names,
context=mxnet.cpu(),
label_names=None)
mod.bind(for_training=False, data_shapes=data_shapes, label_shapes=None)
mod.set_params(arg_params=arg,
aux_params=aux,
allow_missing=True,
allow_extra=True)
# Create input data
Batch = collections.namedtuple('Batch', ['data'])
input_data = Batch([mxnet.nd.array(x)])
# Forward computation using MXNet
mod.forward(input_data)
# Retrieve the output of forward result
mxnet_out = mod.get_outputs()[0].asnumpy()
# Check the prediction results are same
assert np.argmax(chainer_out) == np.argmax(mxnet_out)
# Check both outputs have same values
np.testing.assert_almost_equal(chainer_out, mxnet_out, decimal=5)
def test_fake_as_funcnode_without_replace():
class Model(chainer.Chain):
def _init__(self):
super().__init__()
def add(self, xs, value=0.01):
return xs.array + value
def __call__(self, xs):
return F.sigmoid(self.add(xs))
model = Model()
x = input_generator.increasing(3, 4)
with pytest.raises(onnx.checker.ValidationError):
export(model, x)
def check_output(model, x):
with tempfile.NamedTemporaryFile('wb') as fp:
onnx_chainer.export(model, x, fp)
onnx_model = onnx.ModelProto.FromString(open(fp.name, 'rb').read())
init_net, predict_net = Caffe2Backend.onnx_graph_to_caffe2_net(
onnx_model.graph, device='CPU')
benchmark_caffe2_model(init_net, predict_net)
y = model(x)
if isinstance(y, dict):
y = y['prob']
chainer_out = y.array
caffe2_out = run_model(onnx_model, [x])[0]
np.testing.assert_almost_equal(chainer_out, caffe2_out, decimal=5)
def check_output(model, x, fn, out_key='prob', opset_version=None):
if opset_version is None:
opset_version = onnx.defs.onnx_opset_version()
if not ONNXRUNTIME_AVAILABLE:
raise ImportError('check_output requires onnxruntime.')
chainer.config.train = False
# Forward computation
if isinstance(x, (list, tuple)):
for i in x:
assert isinstance(i, (np.ndarray, chainer.Variable))
chainer_out = model(*x)
x = tuple(
_x.array if isinstance(_x, chainer.Variable) else _x for _x in x)
elif isinstance(x, np.ndarray):
chainer_out = model(chainer.Variable(x))
x = (x,)
elif isinstance(x, chainer.Variable):
chainer_out = model(x)
x = (x.array,)
else:
raise ValueError(
'The \'x\' argument should be a list or tuple of numpy.ndarray or '
'chainer.Variable, or simply a numpy.ndarray or a chainer.Variable'
' itself. But a {} object was given.'.format(type(x)))
if isinstance(chainer_out, (list, tuple)):
chainer_out = (y.array for y in chainer_out)
elif isinstance(chainer_out, dict):
chainer_out = chainer_out[out_key]
if isinstance(chainer_out, chainer.Variable):
chainer_out = (chainer_out.array,)
elif isinstance(chainer_out, chainer.Variable):
chainer_out = (chainer_out.array,)
else:
raise ValueError('Unknown output type: {}'.format(type(chainer_out)))
onnx_model = onnx_chainer.export(model, x, fn, opset_version=opset_version)
sess = rt.InferenceSession(onnx_model.SerializeToString())
input_names = [i.name for i in sess.get_inputs()]
# To detect unexpected inputs created by exporter, check input names
# TODO(disktnk): `input_names` got from onnxruntime session includes only
# network inputs, does not include internal inputs such as
# weight attribute etc. so that need to collect network
# inputs from `onnx_model`.
initialized_graph_input_names = {
i.name for i in onnx_model.graph.initializer}
graph_input_names = [i.name for i in onnx_model.graph.input
if i.name not in initialized_graph_input_names]
assert input_names == list(sorted(graph_input_names))
rt_out = sess.run(
None, {name: array for name, array in zip(input_names, x)})
for cy, my in zip(chainer_out, rt_out):
np.testing.assert_almost_equal(cy, my, decimal=5)
def compile(self, inputs):
if self.translator == 'ch2o':
xmodel = ch2o.compile_model(self.mc, inputs)
f = tempfile.NamedTemporaryFile(delete=False)
f.write(xmodel.SerializeToString())
f.close()
del xmodel
elif self.translator == 'onnx_chainer':
import onnx_chainer
f = tempfile.NamedTemporaryFile(delete=False)
onnx_chainer.export(self.mc, inputs, filename=f)
f.close()
else:
raise NotImplementedError('Unsupported translator:',
self.translator)
graph = chainer_compiler_core.load(f.name)
os.unlink(f.name)
self.orig_output_names = graph.output_names()
if self.computation_order is None:
fwd_graph, bwd_graph = graph.backward_to(graph.input_names() +
graph.param_names())
else:
fwd_graph, bwd_graph = graph.backward_to_with_order(
self.computation_order)
if self.dump_onnx:
sys.stderr.write('=== vvv forward vvv ===\n' + fwd_graph.dump() +
'\n=== ^^^ forward ^^^ ===\n')
sys.stderr.write('=== vvv backward vvv ===\n' + bwd_graph.dump() +
'\n=== ^^^ backward ^^^ ===\n')
assert graph.input_names() == fwd_graph.input_names()
self.fwd_input_names = fwd_graph.input_names()
self.fwd_output_names = fwd_graph.output_names()
self.bwd_input_names = bwd_graph.input_names()
self.bwd_output_names = bwd_graph.output_names()
# TODO(hamaji): Revive shape inference.
self.fwd = fwd_graph.compile(skip_inference=True)
self.bwd = bwd_graph.compile(skip_inference=True)
self.param_names = fwd_graph.param_names()
self.compiled = True
def _run_translator(translator, mc, inputs):
if translator == 'ch2o':
from chainer_compiler import ch2o
xmodel = ch2o.compile_model(mc, inputs)
f = tempfile.NamedTemporaryFile(delete=False)
f.write(xmodel.SerializeToString())
f.close()
del xmodel
elif translator == 'onnx_chainer':
import onnx_chainer
f = tempfile.NamedTemporaryFile(delete=False)
onnx_chainer.export(mc, inputs, filename=f)
f.close()
else:
raise NotImplementedError('Unsupported translator:', translator)
graph = _chainer_compiler_core.load(f.name)
os.unlink(f.name)
return graph
def main():
for key, value in srcnn.archs.items():
model_dir = '../models/{}'.format(key.lower())
for filename in os.listdir(model_dir):
basename, ext = os.path.splitext(filename)
onnx_path = os.path.join(model_dir, basename + '.onnx')
if ext == '.npz':
model_path = os.path.join(model_dir, filename)
print(model_path)
channels = 3 if 'rgb' in filename else 1
model = value(channels)
size = 64 + model.offset
data = np.zeros((1, channels, size, size), dtype=np.float32)
x = chainer.Variable(data)
try:
chainer.serializers.load_npz(model_path, model)
caffe.export(model, [x], model_dir, True, basename)
rename_caffe_model(model_dir, basename)
except Exception:
print('Skipped caffe model export')
onnx_chainer.export(model, x, filename=onnx_path)
def test_output_type_check(self):
class Model(chainer.Chain):
def __init__(self, out_kind):
super().__init__()
self.out_kind = out_kind
def __call__(self, x):
if self.out_kind == 'array':
return x.array
elif self.out_kind == 'array_in_tuple':
return x, x.array
elif self.out_kind == 'list_in_tuple':
return ([x]),
else:
assert self.out_kind == 'var'
return x
model = Model(self.out_kind)
x = np.ones((1, 3, 4, 5), dtype=np.float32)
if self.out_kind == 'var':
export(model, (x, )) # should be no error
elif self.out_kind == 'array':
with self.assertRaises(RuntimeError) as e:
export(model, (x, ))
assert 'Unexpected output type'.find(e.exception.args[0])
else:
with self.assertRaises(ValueError) as e:
export(model, (x, ))
assert 'must be Chainer Variable'.find(e.exception.args[0])
def export(model, inputs, filename=None, translator='onnx_chainer'):
if translator == 'ch2o':
from chainer_compiler import ch2o
xmodel = ch2o.compile_model(model, inputs)
if filename is None:
f = tempfile.NamedTemporaryFile(delete=False)
else:
f = open(filename, 'wb')
f.write(xmodel.SerializeToString())
f.close()
del xmodel
elif translator == 'onnx_chainer':
import onnx_chainer
if filename is None:
f = tempfile.NamedTemporaryFile(delete=False)
else:
f = open(filename, 'wb')
onnx_chainer.export(model, inputs, filename=f)
f.close()
else:
raise NotImplementedError('Unsupported translator:', translator)
return f.name
#!/usr/bin/env python # -*- coding: utf-8 -*- import sys import numpy as np import cupy import chainer import chainercv.links as C import onnx_chainer model = C.ResNet50(pretrained_model='imagenet', arch='he') #model = C.VGG16(pretrained_model='imagenet') model.to_gpu() # Pseudo input x = chainer.Variable(cupy.zeros((1, 3, 224, 224), dtype=np.float32)) onnx_chainer.export(model, x, filename='resnet50.onnx')