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how to store bag of words vocabulary efficiently?

Hello All,

I am training my system against Partially Annotated Databases The Caltech Database given here http://pascallin.ecs.soton.ac.uk/challenges/VOC/databases.html.

I am using "bag of words" algorithm for vocabulary building and detection. My YML file is huge. So everytime I pass an image for detection the ~65MB yml file is loaded and then the object is detected. How can I do it more efficiently ?? Or is there some other way to store the vocabulary ??

I am badly stuck at it please help!!

Thanks in advance. Aditi K