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AkashKhamkar
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Upload segmentation.py
Browse files- segmentation.py +107 -0
segmentation.py
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from functools import lru_cache
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import attr
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import pandas as pd
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import numpy as np
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import spacy
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from nltk.tokenize.texttiling import TextTilingTokenizer
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from sklearn.metrics.pairwise import cosine_similarity
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from sentence_transformers import SentenceTransformer
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@lru_cache
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def load_sentence_transformer(model_name='all-MiniLM-L6-v2'):
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"""
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all_MiniLM_L6_v2 - offline
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all-MiniLM-L6-v2 - Online
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"""
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model = SentenceTransformer(model_name)
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return model
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@lru_cache
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def load_spacy():
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return spacy.load('en_core_web_sm')
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model = load_sentence_transformer()
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nlp = load_spacy()
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@attr.s
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class SemanticTextSegmentation:
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"""
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Segment a call transcript based on topics discussed in the call using
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TextTilling with Sentence Similarity via sentence transformer.
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Paramters
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---------
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data: pd.Dataframe
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Pass the trascript in the dataframe format
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utterance: str
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pass the column name which represent utterance in transcript dataframe
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"""
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data = attr.ib()
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utterance = attr.ib(default='utterance')
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def __attrs_post_init__(self):
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columns = self.data.columns.tolist()
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def get_segments(self, threshold=0.7):
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"""
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returns the transcript segments computed with texttiling and sentence-transformer.
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Paramters
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---------
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threshold: float
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sentence similarity threshold. (used to merge the sentences into coherant segments)
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Return
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------
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new_segments: list
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list of segments
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"""
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segments = self._text_tilling()
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merge_index = self._merge_segments(segments, threshold)
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new_segments = []
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for i in merge_index:
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seg = ' '.join([segments[_] for _ in i])
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new_segments.append(seg)
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return new_segments
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def _merge_segments(self, segments, threshold):
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segment_map = [0]
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for index, (text1, text2) in enumerate(zip(segments[:-1], segments[1:])):
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sim = self._get_similarity(text1, text2)
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if sim >= threshold:
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segment_map.append(0)
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else:
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segment_map.append(1)
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return self._index_mapping(segment_map)
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def _index_mapping(self, segment_map):
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index_list = []
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temp = []
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for index, i in enumerate(segment_map):
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if i == 1:
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index_list.append(temp)
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temp = [index]
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else:
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temp.append(index)
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index_list.append(temp)
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return index_list
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def _get_similarity(self, text1, text2):
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sentence_1 = [i.text.strip()
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for i in nlp(text1).sents if len(i.text.split(' ')) > 1]
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sentence_2 = [i.text.strip()
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for i in nlp(text2).sents if len(i.text.split(' ')) > 2]
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embeding_1 = model.encode(sentence_1)
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embeding_2 = model.encode(sentence_2)
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embeding_1 = np.mean(embeding_1, axis=0).reshape(1, -1)
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embeding_2 = np.mean(embeding_2, axis=0).reshape(1, -1)
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sim = cosine_similarity(embeding_1, embeding_2)
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return sim
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def _text_tilling(self):
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tt = TextTilingTokenizer(w=15, k=10)
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text = '\n\n\t'.join(self.data[self.utterance].tolist())
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segment = tt.tokenize(text)
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segment = [i.replace("\n\n\t", ' ') for i in segment]
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return segment
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