“float”类型的对象没有len（）

Question

我正在尝试实现一个MLP来预测一个二次方程的下一个值，但是当我要测试网络时，我一直有同样的问题，你们能给我一些关于它的信息吗？在

错误=类型为“float”的对象没有len（）

from pybrain.datasets import SupervisedDataSet
from pybrain.tools.shortcuts import buildNetwork
from pybrain.structure import TanhLayer
from pybrain.supervised.trainers import BackpropTrainer
import pandas as pd
import numpy as np

#Preparing Data
dataset = pd.read_csv("C:\Users\gugub\Documents\projects\Cyrus\graph.data", header = None)
darray = np.array(dataset)

ds = SupervisedDataSet(1,1)

ds.addSample([0.2],[0.04])
ds.addSample([0.3],[0.09])
ds.addSample([0.4],[0.16])
ds.addSample([0.5],[0.25])
ds.addSample([0.6],[0.36])

#Buildin Network
net = buildNetwork(1,2,1, hiddenclass = TanhLayer)
trainer = BackpropTrainer(net,ds)
#Training Phase
for k in range(2000):
    print(trainer.train())
#Testing Phase
while True:
    e1 = float(raw_input("x >"))
    print(float(net.activate((e1))))

回溯：

Traceback (most recent call last):

File "", line 1, in runfile('C:/Users/gugub/Documents/projects/Cyrus/backprop.py', wdir='C:/Users/gugub/Documents/projects/Cyrus')

File "C:\Users\gugub\Anaconda2\envs\Workspace\lib\site-packages\spyder\utils\site\sitecustomize.py", line 705, in runfile execfile(filename, namespace)

File "C:\Users\gugub\Anaconda2\envs\Workspace\lib\site-packages\spyder\utils\site\sitecustomize.py", line 87, in execfile exec(compile(scripttext, filename, 'exec'), glob, loc)

File "C:/Users/gugub/Documents/projects/Cyrus/backprop.py", line 28, in print(float(net.activate((e1))))

File "C:\Users\gugub\Anaconda2\envs\Workspace\lib\site-packages\pybrain\structure\networks\feedforward.py", line 20, in activate return super(FeedForwardNetworkComponent, self).activate(inpt)

File "C:\Users\gugub\Anaconda2\envs\Workspace\lib\site-packages\pybrain\structure\modules\module.py", line 104, in activate assert len(self.inputbuffer[self.offset]) == len(inpt), str((len(self.inputbuffer[self.offset]), len(inpt)))

TypeError: object of type 'float' has no len()