编程语言
首页 > 编程语言> > Python / Keras / Theano-ValueError:尺寸不匹配;形状为(98,10),(98,1)

Python / Keras / Theano-ValueError:尺寸不匹配;形状为(98,10),(98,1)

作者:互联网

我一直在尝试使用以下代码运行神经网络:

model=Sequential()
model.add(Dense(output_dim=40, input_dim=90, init="glorot_uniform"))
model.add(Activation("tanh"))
model.add(Dense(output_dim=10, init="glorot_uniform"))
model.add(Activation("linear"))
model.compile(loss="mean_absolute_percentage_error", optimizer="rmsprop")
model.fit(X=predictor_train, y=target_train, nb_epoch=2, batch_size=90,show_accuracy=True)

我还无法找出此错误的含义:

raise ValueError(base_exc_str)
ValueError: Dimension mismatch; shapes are (98, 10), (98, 1)

据我了解,形状应该相等,例如(98,10),(98,10)或(98,1),(98,1),这就是造成问题的原因.那正确吗?

如果是,是否有人知道我可以在代码或数据集中的哪个位置进行修复?那10和1是什么意思?

如果没有,谁能向我解释发生了什么?

额外的信息:

变量预测变量:

predictor_train.shape = (98, 90)
type(predictor_train) = numpy.ndarray
predictor_train.dtype = float64
len(predictor_train) = 98

predictor_train = [[ -9.28079499e+03  -5.44726790e+03   9.77551565e+03 ...,  -2.94089612e+01
1.05007607e+01   9.32395201e+00]
[ -9.32333218e+03  -4.06918099e+03   8.84849310e+03 ...,   3.02589395e+01
1.32480085e+01   7.35936371e+00]
[ -9.08950902e+03  -2.59672093e+03   6.78783637e+03 ...,  -7.22732280e+00
-8.72789507e+00  -3.38694330e+01]
..., 
[  6.00971088e+03   4.82090785e+02   2.06287833e+03 ...,   5.07504624e+00
-1.08715262e+01  -4.44630971e+00]
[  6.02593657e+03   1.04561016e+03   1.19684456e+03 ...,   2.10305449e+01
-1.00583976e+01  -5.45816394e-01]
[  6.11828134e+03   1.50004864e+03   3.00936969e+02 ...,  -1.66676535e+01
6.07002336e+00   3.00131153e+00]]

变量target_train:

target_train.shape = (98,)
type(target_train) = pandas.core.series.Series
target_train.dtype = float64
len(target_train) = 98

target_train =
Date
2007-07-01    0.009137
2007-08-01    0.010607
2007-09-01    0.007146
...
2015-06-01   -0.008642
2015-07-01   -0.008642
2015-08-01   -0.008642
Freq: MS, Name: Actual, dtype: float64

完整回溯:

Traceback (most recent call last):
File "/Users/santanna_santanna/PycharmProjects/Predictive Models/teste2.py", line 1479, in Pred
model.fit(X=predictor_train, y=target_train, nb_epoch=2, batch_size=90,show_accuracy=True)
File "/Library/Python/2.7/site-packages/keras/models.py", line 581, in fit
shuffle=shuffle, metrics=metrics)
File "/Library/Python/2.7/site-packages/keras/models.py", line 239, in _fit
outs = f(ins_batch)
File "/Library/Python/2.7/site-packages/keras/backend/theano_backend.py", line 365, in __call__
return self.function(*inputs)
File "/Library/Python/2.7/site-packages/theano/compile/function_module.py", line 595, in __call__
outputs = self.fn()
File "/Library/Python/2.7/site-packages/theano/gof/vm.py", line 233, in __call__
link.raise_with_op(node, thunk)
File "/Library/Python/2.7/site-packages/theano/gof/vm.py", line 229, in __call__
thunk()
File "/Library/Python/2.7/site-packages/theano/gof/op.py", line 768, in rval
r = p(n, [x[0] for x in i], o)
File "/Library/Python/2.7/site-packages/theano/tensor/elemwise.py", line 808, in perform
raise ValueError(base_exc_str)
ValueError: Dimension mismatch; shapes are (98, 10), (98, 1)
Apply node that caused the error: Elemwise{Sub}[(0, 0)](Elemwise{Add}[(0, 0)].0, <TensorType(float32, matrix)>)
Inputs types: [TensorType(float32, matrix), TensorType(float32, matrix)]
Inputs shapes: [(98, 10), (98, 1)]
Inputs strides: [(40, 4), (4, 4)]
Inputs values: ['not shown', 'not shown']

HINT: Re-running with most Theano optimization disabled could give you a back-trace of when this node was created. This can be done with by setting the Theano flag 'optimizer=fast_compile'. If that does not work, Theano optimizations can be disabled with 'optimizer=None'.
HINT: Use the Theano flag 'exception_verbosity=high' for a debugprint and storage map footprint of this apply node.

解决方法:

不匹配是在预期的输出尺寸(98,10)和您使用的数据尺寸(98,1)之间

这是因为您使用的示例代码应该在10类数据库上进行分类.如果要进行预测,则将最后一层更改为

model.add(Dense(output_dim=1, init="glorot_uniform"))

另外,我认为您的成本函数会出现问题.如果您有连续数据,则不应使用绝对百分比误差.改变这个

model.compile(loss="mean_absolute_percentage_error", optimizer="rmsprop")

为此,也许

model.compile(loss="mean_squared_error", optimizer="rmsprop")

标签:keras,theano,python,numpy
来源: https://codeday.me/bug/20191119/2032594.html