'theano.tensor.cast'返回的变量类型

Question

当输入是共享变量时，theano.tensor.cast返回的变量的确切类型是什么？

例如，执行以下代码：

import theano.tensor as T
from theano import function, shared
import numpy as np

x = shared(np.array([1.1, 2.2, 3.3, 4.4, 5.5], dtype = np.float64))
y = T.cast(x, 'int32')
print type(x)     # <class 'theano.tensor.sharedvar.TensorSharedVariable'>
print type(y)     # <class 'theano.tensor.var.TensorVariable'>

'''
however, the variable y has value like "shared variable"
'''

f = function([], y[:3])
print f()            # it shows ''[1 2 3]''

那么......变量y的类型是什么？