我想知道如何在两个版本之间进行转换,因为量化功能似乎主要用于syms, arg_params, aux_params
元组样式传递,可以很好地将其包装在模块周围,但不能在胶子模型上进行包装(如果我错了。
这是一个训练cnn模型的小代码段:
batch_size = 64
num_inputs = 784
num_outputs = 10
data_iter = mx.io.NDArrayIter(x, y, batch_size=batch_size)
num_fc = 512
net = gluon.nn.HybridSequential()
with net.name_scope():
net.add(gluon.nn.Conv2D(channels=20, kernel_size=5, activation='relu'))
net.add(gluon.nn.MaxPool2D(pool_size=2, strides=2))
net.add(gluon.nn.Conv2D(channels=50, kernel_size=5, activation='relu'))
net.add(gluon.nn.MaxPool2D(pool_size=2, strides=2))
net.add(gluon.nn.Flatten())
net.add(gluon.nn.Dense(num_fc, activation="relu"))
net.add(gluon.nn.Dense(num_outputs))
net.hybridize()
# Parameter initialization
net.collect_params().initialize(mx.init.Xavier(magnitude=2.24), ctx=ctx)
trainer = gluon.Trainer(net.collect_params(), 'sgd', {'learning_rate': .1})
softmax_cross_entropy = gluon.loss.SoftmaxCrossEntropyLoss()
for i, batch in enumerate(data_iter):
data = batch.data[0].as_in_context(ctx)
label = batch.label[0].as_in_context(ctx)
with autograd.record():
output = net(data)
loss = softmax_cross_entropy(output, label)
loss.backward()
trainer.step(data.shape[0])
如果我想量化胶子模型,我会尝试将胶子序列化到磁盘中,然后将其作为模块退回。这可能会引起麻烦:
import os
net.export('mxnet')
mod = mx.module.Module.load('mxnet', 0) # 0 epoch
,并按照模块API:
mod.bind( data_shapes = data_iter.provide_data,
label_shapes = data_iter.provide_label)
mod.predict(x)
,但不能通过以下堆栈跟踪对预测工作:
----------------------------------------------
KeyError Traceback (most recent call last)
<ipython-input-10-f53137bb5e95> in <module>()
1 mod.bind( data_shapes = data_iter.provide_data,
----> 2 label_shapes = data_iter.provide_label)
3 mod.predict(x)
~/anaconda3/envs/idp3/lib/python3.6/site-packages/mxnet/module/module.py in bind(self, data_shapes, label_shapes, for_training, inputs_need_grad, force_rebind, shared_module, grad_req)
434 fixed_param_names=self._fixed_param_names,
435 grad_req=grad_req, group2ctxs=self._group2ctxs,
--> 436 state_names=self._state_names)
437 self._total_exec_bytes = self._exec_group._total_exec_bytes
438 if shared_module is not None:
~/anaconda3/envs/idp3/lib/python3.6/site-packages/mxnet/module/executor_group.py in __init__(self, symbol, contexts, workload, data_shapes, label_shapes, param_names, for_training, inputs_need_grad, shared_group, logger, fixed_param_names, grad_req, state_names, group2ctxs)
281
282 eprint(sys._getframe().f_lineno, data_shapes, label_shapes)
--> 283 self.bind_exec(data_shapes, label_shapes, shared_group)
284
285 def decide_slices(self, data_shapes):
~/anaconda3/envs/idp3/lib/python3.6/site-packages/mxnet/module/executor_group.py in bind_exec(self, data_shapes, label_shapes, shared_group, reshape)
388 if label_shapes is not None:
389 self.label_names = [i.name for i in self.label_shapes]
--> 390 self._collect_arrays()
391
392 def reshape(self, data_shapes, label_shapes):
~/anaconda3/envs/idp3/lib/python3.6/site-packages/mxnet/module/executor_group.py in _collect_arrays(self)
324 self.label_arrays = [[(self.slices[i], e.arg_dict[name])
325 for i, e in enumerate(self.execs)]
--> 326 for name, _ in self.label_shapes]
327 else:
328 self.label_arrays = None
~/anaconda3/envs/idp3/lib/python3.6/site-packages/mxnet/module/executor_group.py in <listcomp>(.0)
324 self.label_arrays = [[(self.slices[i], e.arg_dict[name])
325 for i, e in enumerate(self.execs)]
--> 326 for name, _ in self.label_shapes]
327 else:
328 self.label_arrays = None
~/anaconda3/envs/idp3/lib/python3.6/site-packages/mxnet/module/executor_group.py in <listcomp>(.0)
323 eprint(323, e.arg_dict.keys())
324 self.label_arrays = [[(self.slices[i], e.arg_dict[name])
--> 325 for i, e in enumerate(self.execs)]
326 for name, _ in self.label_shapes]
327 else:
KeyError: 'softmax_label'
哪个抱怨我在我的e.arg_dict
中缺少该标签。
我打印了e.arg_dict
:
(['data', 'hybridsequential1_conv0_weight', 'hybridsequential1_conv0_bias', 'hybridsequential1_conv1_weight', 'hybridsequential1_conv1_bias', 'hybridsequential1_dense0_weight', 'hybridsequential1_dense0_bias', 'hybridsequential1_dense1_weight', 'hybridsequential1_dense1_bias'])
确实,softmax_label
不存在。这个标签来自哪里,如何将模块正确转换为胶粘剂?
答案 0 :(得分:1)
对于问题的第一部分(标签从何而来?)
默认情况下,当您将label_shapes = data_iter.provide_label
arg添加到mod.bind
调用时,将添加softmax标签。您可以通过显式设置label_shapes = None
来删除它。
有关详细信息,请参见https://discuss.mxnet.io/t/gluon-module-what-is-label-name-and-why-do-i-need-labels-for-modules-to-run-bind/1433的答案。
对于问题的第二部分(如何将模块正确转换为gluon模型?):
要将符号模型转换为胶子模型,您可以
mod.save_checkpoint
将符号模型保存到磁盘或
mod.save_params
net
net.load_params(filename, ctx=ctx)
例如:
mod.save_params('mxnet.params')
net2 = gluon.nn.HybridSequential()
with net2.name_scope():
net2.add(gluon.nn.Conv2D(channels=20, kernel_size=5, activation='relu'))
net2.add(gluon.nn.MaxPool2D(pool_size=2, strides=2))
net2.add(gluon.nn.Conv2D(channels=50, kernel_size=5, activation='relu'))
net2.add(gluon.nn.MaxPool2D(pool_size=2, strides=2))
net2.add(gluon.nn.Flatten())
net2.add(gluon.nn.Dense(num_fc, activation="relu"))
net2.add(gluon.nn.Dense(num_outputs))
net2.hybridize()
net2.load_params('mxnet.params', ctx=ctx)