168 lines
4.6 KiB
Python
168 lines
4.6 KiB
Python
#We have to import the files
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#Split the indexer into 4 parts
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#Alphanumeric sequences into the dataset
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#Stemming
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#Text in bold, headings and other titles should be treated as more important
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#Posting structure > tf-idf score. Name/id the token was found in . So hashmap.
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#We need shelves to hold the data.
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#Posting ---> Source of file, tf-idf score. #for now we will only use these two, as we get more complex posting will be change accordingly
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#Data input
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import json
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import os
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import shelve
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from bs4 import BeautifulSoup
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from time import perf_counter
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import time
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import threading
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from threading import Lock
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#Data process
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from nltk.tokenize import word_tokenize
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from nltk.stem import PorterStemmer
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from sklearn.feature_extraction.text import TfidfVectorizer
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import pandas as pd
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import numpy as np
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import re
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#Logging postings
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from posting import Posting
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from worker import Worker
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class Indexer():
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def __init__(self,restart,list_partials,weight,data_paths,worker_factory=Worker):
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#Config stuffs
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self.path = "test/"
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self.restart = restart
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self.list_partials = list_partials
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self.weight = weight
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self.data_paths = data_paths
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self.data_paths_lock = Lock()
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self.list_partials_lock = Lock()
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self.workers = list()
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self.worker_factory = worker_factory
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def start_async(self):
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self.workers = [
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self.worker_factory(worker_id,self)
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for worker_id in range(8)]
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for worker in self.workers:
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worker.start()
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def start(self):
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self.start_async()
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self.join()
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def join(self):
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for worker in self.workers:
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worker.join()
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def get_data_path(self):
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for directory in os.listdir(self.path):
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for file in os.listdir(self.path + "/" + directory + "/"):
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self.data_paths.append("data/DEV/" + directory + "/"+file)
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def get_next_file(self):
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self.data_paths_lock.acquire()
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try:
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holder = self.data_paths.pop()
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self.data_paths_lock.release()
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return holder
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except IndexError:
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self.data_paths_lock.release()
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return None
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def add_partial_index(self,partial_index):
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self.list_partials_lock.acquire()
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self.list_partials.append(partial_index)
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self.list_partials_lock.release()
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#Found 55770 documents
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#
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#getting important tokens
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def merge(self):
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partial_files = list()
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partial_index_files = list()
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parital_index_indices = list()
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merged_index = open("merged_index.full",'w')
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num_indices = len(self.list_partials)
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#Full Index.Index and Length
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full_index = Index()
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full_index.index = list()
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full_index.length = 0
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for partial_index in self.list_partials:
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file = open(partial_index+'.partial','r')
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partial_files.append(file)
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index = open(partial_index+'.index','r')
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partial_index_files.append(index)
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for partial_index_file in partial_index_files:
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partial_index_file.seek(0,0)
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parital_index_indices.append(json.loads(partial_index_file.readline()))
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#Start all indexes at 0
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for partial_file in partial_files:
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partial_file.seek(0,0)
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pointers = [0]*num_indices
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while(True):
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#Get all values from all indices to find min
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value = None
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values = list()
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for i in range(num_indices):
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if pointers[i] < parital_index_indices[i]['length']:
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values.append(parital_index_indices[i]['index'][pointers[i]][0])
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if(len(values) == 0):
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break
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value = min(values)
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#Get data from the min value of all indices if exists then save to mergedIndex
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if value == None:
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print("I have crashed some how by not getting min value")
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break
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node = Node()
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node.index_value = value
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for i in range(num_indices):
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if pointers[i] < parital_index_indices[i]['length'] and parital_index_indices[i]['index'][pointers[i]][0] == value:
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to_seek = parital_index_indices[i]['index'][pointers[i]][1]
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partial_files[i].seek(to_seek,0)
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json_value = partial_files[i].readline()
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temp_node = json.loads(json_value)
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node.postings = node.postings + temp_node['postings']
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pointers[i] = pointers[i] + 1
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node.postings.sort(key=lambda y:y['doc_id'])
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full_index.index.append((value,merged_index.tell()))
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full_index.length = full_index.length + 1
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jsonStr = json.dumps(node,default=lambda o: o.__dict__,sort_keys=False)
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merged_index.write(jsonStr + '\n')
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full_index.index.sort(key=lambda y:y[0])
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jsonStr =json.dumps(full_index, default=lambda o: o.__dict__,sort_keys=False)
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with open("merged_index.index" ,'w') as f:
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f.write(jsonStr)
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def main():
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indexer = Indexer(True,list(),list(),list())
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indexer.get_data_path()
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indexer.start()
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indexer.merge()
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if __name__ == "__main__":
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main() |