在Dynet中添加numpy数组和表达式的正确方法?

from dynet import *
import numpy as np
import numpy.matlib as npm

model = ParameterCollection()
....
LayerA = model.add_parameters((1, 100))
LayerA = model.add_parameters((1, 100))
...
normal = np.random.normal(npm.zeros((1, 100)), npm.ones((1, 100)))
Layer = LayerA + cmult(LayerB,normal) # cmult is Dynet component-wise multiplication
...
output = Layer.expr() * activation(...)

它给了我以下的错误,

TypeError: Argument 'x' has incorrect type (expected _dynet.Expression, got _dynet.Parameters)

所以,我尝试了这个,而不是上面提到的,

Layer = LayerA + cmult(LayerB.expr(),normal)

但它给了我以下的错误,

TypeError: Argument 'y' has incorrect type (expected _dynet.Expression, got numpy.ndarray)

所以我想我可能需要把numpy数组转换成dynet表达式,

Layer = LayerA.expr() + cmult(LayerB.expr(),inputTensor(normal))
...
output = Layer * activation(...)

它毫无差错地通过了,但它在我呼叫的其他地方抱怨 output.scalar_value() ,

terminate called after throwing an instance of 'std::runtime_error'
what():  Input tensor has more than one element, cannot convert to scalar.
Aborted (core dumped)