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def classify(self, texts):
        vectors = self.dictionary.feature_vectors(texts)
        predictions = self.svm.decision_function(vectors)
        predictions = np.transpose(predictions)[0]
        predictions = predictions / 2 + 0.5
        predictions[predictions > 1] = 1
        predictions[predictions < 0] = 0
        return predictions
The error:
TypeError: 'numpy.float64' object does not support item assignment
occurs on the following line:
        predictions[predictions > 1] = 1
Does anyone has an idea of solving this problem? Thanks! 
                On which line does the error occur?  You should always post your "traceback" from Python.
– John Zwinck
                Jan 13, 2015 at 5:17
                You made predictions a scalar when you assigned predictions = np.transpose(predictions)[0].  Therefore, you can't index it any more as you tried to do 2 and 3 lines further down.  What are you trying to accomplish?!
– Alex Martelli
                Jan 13, 2015 at 5:17
                sorry,this line"predictions[predictions > 1] = 1": TypeError: 'numpy.float64' object does not support item assignment
– chen
                Jan 13, 2015 at 5:33
                FWIW, I was getting and error like this with numpy 0.17 and csaps 0.11. Updating to numpy 0.19 and csaps 1.0 fixed the issue. So an upgrade may help with this does not support item assignment error.
– naught101
                Mar 23, 2021 at 4:49
Try this testing code and pay attention to np.array([1,2,3], dtype=np.float64).
It seems self.svm.decision_function(vectors) returns 1d array instead of 2d. 
If you replace [1,2,3] to [[1,2,3], [4,5,6]] everything will be ok. 
import numpy as np
predictions = np.array([1,2,3], dtype=np.float64)
predictions = np.transpose(predictions)[0]
predictions = predictions / 2 + 0.5
predictions[predictions > 1] = 1
predictions[predictions < 0] = 0
Output:
Traceback (most recent call last):
  File "D:\temp\test.py", line 7, in <module>
    predictions[predictions > 1] = 1
TypeError: 'numpy.float64' object does not support item assignment
So, what your vectors are? 
                Hi Max, how to know what's the vectors are? I am using debug on Spider on the same code but I have no idea how to figure out what is inside the vectors variable
– user1314404
                May 28, 2015 at 9:06
                This is numpy indexing (predictions[predictions > 1] = 1), this syntax can work in the correct context
– Guillaume Lebreton
                Nov 8, 2019 at 22:54
        
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