Classifier never outputs 'U'

[lucas0]

Used more than 1500 texts, averaging 400 words each and not a single U word was output by classifier. Seems that the classifier is not working, if it ever did.

[meyersbs]

It looks like you're using the code in multilabel mode; either you passed the -m flag on the command line or are not passing binary=True to Classifer() in the code. In multilabel mode, individual words will not be labeled with a generic U, but instead with a C for certain or one of the four types of uncertainty:

• E: Epistemic - the proposition is possible (based on our knowledge of the universe), but its truth-value cannot be determined.
• D: Doxastic - the proposition is assumed to be true or false, but its truth-value cannot be determined.
• I: Investigation - the proposition is in the process of having its truth-value determined.
• N: Condition - the proposition is truth or false based on the truth-value of another proposition.

I see N and E a few times in your output, which is expected in multilabel. If you were to run the same command without the -m flag (or with binary=True), then it would only output C or U.

See the wiki for more information.