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import argparse
import glob
from os.path import join
from tokenizers import ByteLevelBPETokenizer
parser = argparse.ArgumentParser()
parser.add_argument(
"--files",
default=None,
metavar="path",
type=str,
required=True,
help="The files to use as training; accept '**/*.txt' type of patterns \
if enclosed in quotes",
)
parser.add_argument(
"--out",
default="./",
type=str,
help="Path to the output directory, where the files will be saved",
)
parser.add_argument("--name", default="bpe-bytelevel", type=str, help="The name of the output vocab files")
args = parser.parse_args()
files = glob.glob(args.files)
if not files:
print(f"File does not exist: {args.files}")
exit(1)
# Initialize an empty tokenizer
tokenizer = ByteLevelBPETokenizer(add_prefix_space=True)
# And then train
tokenizer.train(
files,
vocab_size=10000,
min_frequency=2,
show_progress=True,
special_tokens=["<s>", "<pad>", "</s>"],
)
# Save the files
tokenizer.save_model(args.out, args.name)
# Restoring model from learned vocab/merges
tokenizer = ByteLevelBPETokenizer(
join(args.out, "{}-vocab.json".format(args.name)),
join(args.out, "{}-merges.txt".format(args.name)),
add_prefix_space=True,
)
# Test encoding
print(tokenizer.encode("Training ByteLevel BPE is very easy").tokens)
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