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from haystack.nodes import TransformersDocumentClassifier |
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from haystack.schema import Document |
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from typing import List, Tuple |
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import configparser |
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import streamlit as st |
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from pandas import DataFrame, Series |
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import logging |
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from utils.preprocessing import processingpipeline |
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config = configparser.ConfigParser() |
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config.read_file(open('paramconfig.cfg')) |
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@st.cache(allow_output_mutation=True) |
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def load_sdgClassifier(): |
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""" |
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loads the document classifier using haystack, where the name/path of model |
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in HF-hub as string is used to fetch the model object. |
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1. https://docs.haystack.deepset.ai/reference/document-classifier-api |
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2. https://docs.haystack.deepset.ai/docs/document_classifier |
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Return: document classifier model |
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""" |
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logging.info("Loading classifier") |
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doc_classifier_model = config.get('sdg','MODEL') |
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doc_classifier = TransformersDocumentClassifier( |
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model_name_or_path=doc_classifier_model, |
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task="text-classification") |
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return doc_classifier |
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def sdg_classification(haystackdoc:List[Document])->Tuple[DataFrame,Series]: |
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""" |
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Text-Classification on the list of texts provided. Classifier provides the |
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most appropriate label for each text. these labels are in terms of if text |
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belongs to which particular Sustainable Devleopment Goal (SDG). |
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Params |
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--------- |
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haystackdoc: List of haystack Documents. The output of Preprocessing Pipeline |
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contains the list of paragraphs in different format,here the list of |
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Haystack Documents is used. |
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Returns |
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---------- |
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df: Dataframe with two columns['SDG:int', 'text'] |
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x: Series object with the unique SDG covered in the document uploaded and |
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the number of times it is covered/discussed/count_of_paragraphs. |
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""" |
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logging.info("running SDG classifiication") |
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threshold = float(config.get('sdg','THRESHOLD')) |
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classifier = load_sdgClassifier() |
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results = classifier.predict(haystackdoc) |
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labels_= [(l.meta['classification']['label'], |
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l.meta['classification']['score'],l.content,) for l in results] |
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df = DataFrame(labels_, columns=["SDG","Relevancy","text"]) |
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df = df.sort_values(by="Relevancy", ascending=False).reset_index(drop=True) |
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df.index += 1 |
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df =df[df['Relevancy']>threshold] |
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x = df['SDG'].value_counts() |
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df= df.drop(['Relevancy'], axis = 1) |
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return df, x |
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def runSDGPreprocessingPipeline()->List[Document]: |
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""" |
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creates the pipeline and runs the preprocessing pipeline, |
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the params for pipeline are fetched from paramconfig |
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Return |
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-------------- |
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List[Document]: When preprocessing pipeline is run, the output dictionary |
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has four objects. For the Haysatck implementation of SDG classification we, |
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need to use the List of Haystack Document, which can be fetched by |
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key = 'documents' on output. |
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""" |
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file_path = st.session_state['filepath'] |
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file_name = st.session_state['filename'] |
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sdg_processing_pipeline = processingpipeline() |
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split_by = config.get('sdg','SPLIT_BY') |
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split_length = int(config.get('sdg','SPLIT_LENGTH')) |
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split_overlap = int(config.get('sdg','SPLIT_OVERLAP')) |
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output_sdg_pre = sdg_processing_pipeline.run(file_paths = file_path, |
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params= {"FileConverter": {"file_path": file_path, \ |
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"file_name": file_name}, |
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"UdfPreProcessor": {"removePunc": False, \ |
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"split_by": split_by, \ |
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"split_length":split_length,\ |
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"split_overlap": split_overlap}}) |
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return output_sdg_pre['documents'] |
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