Predict with infer_cnn_ocr.py predicted: 0000

[abner2015]

when i run infer_cnn_ocr.py after trained ,all of the result is 0.
gen captcha: 8183
[ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1]
[ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1]
[ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1]
[ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1]
predicted: 0000
Does anyone have the same problem?