Delete .ipynb_checkpoints
Browse files
.ipynb_checkpoints/__init__-checkpoint.py
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from .tokenizer import KmerTokenizer
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.ipynb_checkpoints/tokenizer-checkpoint.py
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import itertools
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from transformers import PreTrainedTokenizer
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import json
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import os
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class KmerTokenizer(PreTrainedTokenizer):
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def __init__(self, vocab_file=None, kmerlen=6, overlapping=True, maxlen=400, **kwargs):
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self.kmerlen = kmerlen
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self.overlapping = overlapping
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self.maxlen = maxlen
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# Initialize vocabulary
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self.VOCAB = [''.join(i) for i in itertools.product(*(['ATCG'] * int(self.kmerlen)))]
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self.VOCAB_SIZE = len(self.VOCAB) + 5
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self.tokendict = dict(zip(self.VOCAB, range(5, self.VOCAB_SIZE)))
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self.tokendict['[UNK]'] = 0
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self.tokendict['[SEP]'] = 1
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self.tokendict['[CLS]'] = 2
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self.tokendict['[MASK]'] = 3
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self.tokendict['[PAD]'] = 4
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super().__init__(**kwargs)
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def _tokenize(self, text):
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tokens = []
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stoprange = len(text) - (self.kmerlen - 1)
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if self.overlapping:
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for k in range(0, stoprange):
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kmer = text[k:k + self.kmerlen]
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if set(kmer).issubset('ATCG'):
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tokens.append(kmer)
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else:
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for k in range(0, stoprange, self.kmerlen):
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kmer = text[k:k + self.kmerlen]
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if set(kmer).issubset('ATCG'):
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tokens.append(kmer)
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return tokens
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def _convert_token_to_id(self, token):
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return self.tokendict.get(token, self.tokendict['[UNK]'])
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def _convert_id_to_token(self, index):
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inv_tokendict = {v: k for k, v in self.tokendict.items()}
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return inv_tokendict.get(index, '[UNK]')
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def convert_tokens_to_string(self, tokens):
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return ' '.join(tokens)
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def build_inputs_with_special_tokens(self, token_ids_0, token_ids_1=None):
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if token_ids_1 is None:
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return [self.tokendict['[CLS]']] + token_ids_0 + [self.tokendict['[SEP]']]
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return [self.tokendict['[CLS]']] + token_ids_0 + [self.tokendict['[SEP]']] + token_ids_1 + [self.tokendict['[SEP]']]
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def get_vocab(self):
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return self.tokendict
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def kmer_tokenize(self, seq_list):
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seq_ind_list = []
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for seq in seq_list:
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tokens = self._tokenize(seq)
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token_ids = [self._convert_token_to_id(token) for token in tokens]
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if len(token_ids) < self.maxlen:
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token_ids.extend([self.tokendict['[PAD]']] * (self.maxlen - len(token_ids)))
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else:
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token_ids = token_ids[:self.maxlen]
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seq_ind_list.append(token_ids)
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return seq_ind_list
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def save_vocabulary(self, save_directory, filename_prefix=None):
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if not os.path.isdir(save_directory):
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os.makedirs(save_directory)
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vocab_file = os.path.join(save_directory, (filename_prefix + '-' if filename_prefix else '') + 'vocab.json')
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with open(vocab_file, 'w') as f:
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json.dump(self.tokendict, f)
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return (vocab_file,)
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def save_pretrained(self, save_directory, **kwargs):
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special_tokens_map_file = os.path.join(save_directory, "special_tokens_map.json")
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with open(special_tokens_map_file, "w") as f:
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json.dump({
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"kmerlen": self.kmerlen,
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"overlapping": self.overlapping,
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"maxlen": self.maxlen
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}, f)
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vocab_files = self.save_vocabulary(save_directory)
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return (special_tokens_map_file,) + vocab_files
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@classmethod
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def from_pretrained(cls, pretrained_model_name_or_path, *model_args, **kwargs):
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# Load tokenizer using the parent class method
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tokenizer = super().from_pretrained(pretrained_model_name_or_path, *model_args, **kwargs)
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# Load special tokens map
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special_tokens_map_file = os.path.join(pretrained_model_name_or_path, "special_tokens_map.json")
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if os.path.isfile(special_tokens_map_file):
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with open(special_tokens_map_file, "r") as f:
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special_tokens_map = json.load(f)
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tokenizer.kmerlen = special_tokens_map.get("kmerlen", 6)
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tokenizer.overlapping = special_tokens_map.get("overlapping", True)
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tokenizer.maxlen = special_tokens_map.get("maxlen", 400)
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# Load vocabulary
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vocab_file = os.path.join(pretrained_model_name_or_path, "vocab.json")
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if os.path.isfile(vocab_file):
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with open(vocab_file, "r") as f:
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tokendict = json.load(f)
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tokenizer.tokendict = tokendict
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return tokenizer
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