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ocr2vw.py
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ocr2vw.py
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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))