Mailgun Talon: Signature extraction example throwing error - mailgun

Question

I installed mailgun/talon on GCE and was trying out the example in the README section, but it threw the following error at me:
>>> from talon import signature
>>> message = """Thanks Sasha, I can't go any higher and is why I limited it to the
... homepage.
...
... John Doe
... via mobile"""
>>> message
"Thanks Sasha, I can't go any higher and is why I limited it to the\nhomepage.\n\nJohn Doe\nvia mobile"
>>> text,signtr = signature.extract(message, sender='john.doe#example.com')
ERROR:talon.signature.extraction:ERROR when extracting signature with classifiers
Traceback (most recent call last):
File "talon/signature/extraction.py", line 57, in extract
markers = _mark_lines(lines, sender)
File "talon/signature/extraction.py", line 99, in _mark_lines
elif is_signature_line(line, sender, EXTRACTOR):
File "talon/signature/extraction.py", line 40, in is_signature_line
return classifier.decisionFunc(data, 0) > 0
AttributeError: 'NoneType' object has no attribute 'decisionFunc'
Do I need to train the model somehow (this signature seems to be the ML example)? I installed it using pip.

Answer 1

If you want to use signature parsing with classifiers you just need to call talon.init() before using the lib - it loads trained classifiers. Other methods like talon.signature.bruteforce.extract_signature() or talon.quotations.extract_from() don't require classifiers. Here's a full code sample:
import talon
# don't forget to init the library first
# it loads machine learning classifiers
talon.init()
from talon import signature
message = """Thanks Sasha, I can't go any higher and is why I limited it to the
homepage.
John Doe
via mobile"""
text, signature = signature.extract(message, sender='john.doe#example.com')
# text == "Thanks Sasha, I can't go any higher and is why I limited it to the\nhomepage."
# signature == "John Doe\nvia mobile"