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your evalData is growing with any pass Mat you push to it, so you cannot use

float response = svm.predict(evalData)

if you want to do a single prediction (inside that loop), use:

 float response = svm.predict(pass);

if you want to collect your bow vectors, and do a bulk prediction, move it after the loop, and use:

Mat result = new Mat();
svm.predict( evalData, result );

your evalData is growing with any pass Mat you push to it, so you cannot use

float response = svm.predict(evalData)

if you want to do a single prediction (inside that loop), use:

 float response = svm.predict(pass);

if you want to collect your bow vectors, and do a bulk prediction, move it after the loop, and use:

Mat result = new Mat();
svm.predict( evalData, result );

Mat mat = imdecode(new Mat(bytes), CV_32FC1); 
// wrong flag here, should be IMREAD_COLOR or similar