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search.py
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search.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
@author: Avani
"""
import math
from collections import defaultdict
import timeit
from wikiIndexer import removeStopWords, stem, tokenise
wlist = []
tlist = []
title_dic = defaultdict(int)
opt_dict = defaultdict(int)
global no_of_docs
def get_docNum():
global no_of_docs
with open("tmp/doc_count.txt", "r") as fp:
for line in fp:
no_of_docs = int(line.strip())
return no_of_docs
print(no_of_docs)
no_of_docs = get_docNum()
def load_title():
global tlist
global title_dic
with open("tmp/title_offsets", "r") as fp1:
for line in fp1:
line = line.strip().split()
title_dic[int(line[0].strip())] = int(line[1].strip())
fp1.close()
tlist = sorted(list(title_dic.keys()))
# print(title_dic)
def bsearch_titleno(docid):
global title_dic
global tlist
#print(tlist)
pos = 0
low = 0
high = len(tlist)-1
# print(title_dic)
# print(docid)
while low <= high:
mid = int((low+high)/2)
if int(tlist[mid]) == docid:
return title_dic[docid]
elif tlist[mid] < docid:
pos = mid
low = mid+1
else:
high = mid-1
'''print("title dic")
print(title_dic[tlist[pos]])'''
# print(title_dic[tlist[pos]])
# print(title_dic[tlist[pos]])
#print(docid,pos)
#print(title_dic)
return title_dic[tlist[pos]]
def get_title(fno, docid):
global title_dic
with open("tmp/titles"+str(fno), "r") as fp:
for line in fp:
line = line.split("-")
if int(line[0]) == docid:
# print(line[1].strip("\n"))
return line[1].strip("\n")
def load_offsetfile():
global opt_dict
global wlist
with open("tmp/offset", "r") as fp:
for line in fp:
line = line.strip().split(":")
opt_dict[line[0]] = line[1]
fp.close()
wlist = sorted(list(opt_dict.keys()))
def bsearch_fileno(word):
global opt_dict
#print(opt_dict)
global wlist
#print(wlist)
pos = 0
low = 0
high = len(wlist)-1
while low <= high:
mid = int((low+high)/2)
if wlist[mid] == word:
return opt_dict[word]
# print(opt_dict[word])
elif wlist[mid] < word:
low = mid+1
else:
pos = mid
high = mid-1
# print(opt_dict[wlist[pos]])
return opt_dict[wlist[pos]]
def getList(word, fno):
with open("tmp/file"+str(fno), "r") as fp:
for line in fp:
line = line.strip().split("/")
if line[0] == word:
return line[1]
return []
def rank_simple(posting_dict):
global no_of_docs
rank_list = defaultdict(float)
l = posting_dict.keys()
for word in l:
postlist = posting_dict[word]
if len(postlist) != 0:
postlist = postlist.split(";")
df = len(postlist)
idf = math.log10(10/df)
# print(postlist)
for doc in postlist:
doc = doc.split("-")
doc_id = int(doc[0])
line = doc[1].split(":")
freq = int(line[0][1:])
tf = math.log10(1+freq)
rank_list[doc_id] += tf*idf
# print(rank_list)
return rank_list
def rank_field(posting_dict, query_dict):
global no_of_docs
rank_list = defaultdict(float)
l = posting_dict.keys()
wt = {'t': 140, 'i': 80, 'c': 50, 'e': 20}
for word in l:
postlist = posting_dict[word]
if len(postlist) != 0:
postlist = postlist.split(";")
df = len(postlist)
idf = math.log10(no_of_docs/df)
for doc in postlist:
doc = doc.split("-")
doc_id = int(doc[0])
line = doc[1].split(":")
fields_to_match = query_dict[word]
freq = 0
for j in line:
if j[0] == 'b':
freq += int(j[1:])
for i in fields_to_match:
for j in line:
if i == j[0] and i != "b":
freq += (int(j[1:])*wt[j[0]])
tf = math.log10(1+freq)
rank_list[doc_id] += tf*idf
# print(rank_list)
return rank_list
def simple_query(query):
global title_dic
# print(title_dic)
qwords = tokenise(query)
qwords = removeStopWords(qwords)
qwords = stem(qwords)
posting_dict = defaultdict(list)
for w in qwords:
fno = bsearch_fileno(w)
posting = getList(w, fno)
posting_dict[w] = posting
ranked_list = rank_simple(posting_dict)
if len(ranked_list) == 0:
print("No match found")
else:
ranked_list_sort = sorted(
ranked_list, key=ranked_list.get, reverse=True)
# print(ranked_list.head())
#print("ranked {} title {}".format(ranked_list, get_title(fno,ranked_list_sort[i])))
for i in range(0, 10):
if i >= len(ranked_list_sort):
break
fno = bsearch_titleno(ranked_list_sort[i])
#print(fno, ranked_list_sort[i])
print(get_title(fno, ranked_list_sort[i]))
def create_dict(qdict, line, val):
line = tokenise(line)
line = removeStopWords(line)
line = stem(line)
for i in line:
qdict[i].append(val)
return qdict
def get_fq_dict(inp):
val = 0
t, r, b, inf, c, e = "", "", "", "", "", ""
tmpp = ""
val = len(inp)-1
i, tf, bf, cf, ef, rf, inff = 0, 0, 0, 0, 0, 0, 0
while i < val:
x = inp[i]
y = inp[i+1]
if "i" == x and ":" == y:
tf, bf, cf, ef, rf, inff = 0, 0, 0, 0, 0, 1
i = i+1
elif "t" == x and ":" == y:
tf, bf, cf, ef, rf, inff = 1, 0, 0, 0, 0, 0
i = i+1
elif "b" == x and ":" == y:
tf, bf, cf, ef, rf, inff = 0, 1, 0, 0, 0, 0
i = i+1
elif "c" == x and ":" == y:
tf, bf, cf, ef, rf, inff = 0, 0, 1, 0, 0, 0
i = i+1
elif "e" == x and ":" == y:
tf, bf, cf, ef, rf, inff = 0, 0, 0, 1, 0, 0
i = i+1
elif "r" == x and ":" == y:
tf, bf, cf, ef, rf, inff = 0, 0, 0, 0, 1, 0
i = i+1
elif tf == 1:
t = t+x
elif bf == 1:
b = b+x
elif cf == 1:
c = c+x
elif ef == 1:
e = e+x
elif rf == 1:
r = r+x
elif inff == 1:
inf = inf+x
i = i+1
v = 1
l = len(inp)-1
if tf == v:
t = t+inp[l]
elif bf == v:
b = b+inp[l]
elif cf == v:
c = c+inp[l]
elif ef == v:
e = e+inp[l]
elif rf == v:
r = r+inp[l]
elif inff == 1:
inf = inf+inp[l]
qdict = defaultdict(list)
qdict = create_dict(qdict, t, "t")
qdict = create_dict(qdict, b, "b")
qdict = create_dict(qdict, c, "c")
qdict = create_dict(qdict, e, "e")
qdict = create_dict(qdict, inf, "i")
return qdict
# print(qdict)
def field_query(query):
global title_dic
query_dict = get_fq_dict(query)
qwords = list(query_dict.keys())
posting_dict = defaultdict(list)
for w in qwords:
fno = bsearch_fileno(w)
posting = getList(w, fno)
posting_dict[w] = posting
# print(posting_dict[w])
ranked_list = rank_field(posting_dict, query_dict)
if len(ranked_list) == 0:
print("No match found")
else:
ranked_list_sort = sorted(
ranked_list, key=ranked_list.get, reverse=True)
for i in range(0, 10):
if i >= len(ranked_list_sort):
break
fno = bsearch_titleno(ranked_list_sort[i])
#print(fno, ranked_list_sort[i])
print(get_title(fno, ranked_list_sort[i]))
def main():
load_offsetfile()
load_title()
while True:
print("\n\nEnter Query")
query = input()
query = query.lower()
start = timeit.default_timer()
if ("i:" in query or "b:" in query or "c:" in query or "t:" in query or "e:" in query):
field_query(query)
else:
simple_query(query)
stop = timeit.default_timer()
print ("\ntime :- "+str(stop - start))
# print("tilte")
#print(get_title(943, 59341885))
# print("bsearch")
# print(bsearch_fileno('acd'))
main()