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# convert letter.data to letter.vw
def read_letter_names (fn):
ret = list()
with open(fn) as ins:
for line in ins:
ret.append(line.rstrip())
print "Read %d names from %s" % (len(ret),fn)
return ret
def find_pixel_start (names):
for i in range(len(names)):
if names[i].startswith("p_"):
return i
raise ValueError("No pixel data",names)
def data2vw (ifn, train, test, names):
lineno = 0
trainN = 0
testN = 0
if ifn.endswith(".gz"):
import gzip
iopener = gzip.open
else:
iopener = open
id_pos = names.index("id")
letter_pos = names.index("letter")
pixel_start = find_pixel_start(names)
with iopener(ifn) as ins, open(train,"wb") as trainS, open(test,"wb") as testS:
for line in ins:
lineno += 1
vals = line.rstrip().split('\t')
if len(vals) != len(names):
raise ValueError("Bad field count",
len(vals),len(names),vals,names)
char = vals[letter_pos]
if len(char) != 1:
raise ValueError("Bad letter",char)
if lineno % 10 == 0:
testN += 1
outs = testS
else:
trainN += 1
outs = trainS
outs.write("%d 1 %s-%s|Pixel" % (ord(char)-ord('a')+1,char,vals[id_pos]))
for i in range(pixel_start,len(names)):
if vals[i] != '0':
outs.write(' %s:%s' % (names[i],vals[i]))
outs.write('\n')
print "Read %d lines from %s; wrote %d lines into %s and %d lines into %s" % (
lineno,ifn,trainN,train,testN,test)
if __name__ == '__main__':
import argparse
parser = argparse.ArgumentParser(description='Convert letters.data to VW format')
parser.add_argument('input',help='path to letter.data[.gz]')
parser.add_argument('names',help='path to letter.names')
parser.add_argument('train',help='VW train file location (90%)')
parser.add_argument('test',help='VW test file location (10%)')
args = parser.parse_args()
data2vw(args.input,args.train,args.test,read_letter_names(args.names))
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