test and readme txt

.gitignore

@@ -1,3 +1,5 @@
 /data/
 *.shelve
 /__pycache__/
+/test/
+merged*

README.txt

@@ -0,0 +1,8 @@
+### To create index:
+ 1. Make sure that all requirements are installed, check `requirements.txt` and install using `pip install reqirements.txt`. 
+ 2. Run `python indexer.py` to build index, this may take some time to run.
+ 3. Index is now created.
+### Start search interface:
+Run `python launcher.py` to start the search interface.
+### Perform query:
+To perfrom a search simply enter a query in the textbox and click search. The top results will be displayed.  

TEST.txt

@@ -0,0 +1,52 @@
+
+### Bad:
+- computer science - common
+- university of california irvine -common
+- donald bren - common
+- uci - common
+- informatics - common
+- The Donald Bren School of Information and Computer Sciences - long and common
+- toilet - not likely to be found easily 
+- perfume - not likely to be found
+- SPY×FAMILY - should not exist in data
+- undergraduate - likely to be on tons of pages
+### Good to Meh:
+- liquids in labs - uncommon word with common
+- Alberto Krone-Martins - should have a good amount of results but not absurd 
+- Advising & Planning - should be specific but not too common
+- Honors Program - ^
+- Papaefthymiou - similar to the martins query 
+- General information - there should be quite a few pages with this but not tons
+- Prerequisite Clearing System - has some common and uncommon terms
+- Recruiting - not stupid common
+- counseling - ^ and should only be on a subset of pages
+- social justice - specific terms that should appear without being costly
+### Others tested:
+- masters of computer science - not super common but will have a good amount of pages
+- thornton ics46 notes - name + class + common
+- Theory of Computation - two terms which have high count in papers
+- facility distribution  - two terms which don't really make sense together
+- artificial intelligence history - two common terms with semi-common
+- prospective alumni - should have very few instances of both terms but should be found together
+- enrollment window - should be on only a couple of pages
+- available capstone sponsorship - ^
+- spring seminars - common with term that may be somewhat restricted
+- hackuci - two terms into one that exists in dataset
+- ucinetid help  - specific term with common 
+- course restrictions - specific pages
+- project management - a course name
+- yelan research - term should not exist + common
+- hybrid-learning - common phrase 
+- genshin is a computer game - contains terms that exist and others that don't 
+- computable AI machine learning big data - sentence of CS buzz words (really really common)
+- Publications & Technical Reports - in json file
+- Tutor coordinators - in many json (bold, title, and body)
+- Death Image Service - in some weird areas
+- send anonymous email - only in some
+### Things done for improvement
+ 1. Create index of index for substantial gain in efficiency and speed.
+ 2.  Split TF-IDF into TF and IDF for more specific calculations when needed without the whole computation. This also removes the relevance on external library for TF-IDF.
+ 3. Switched from using IDF & weight, to TF & weight for helping with the overall weight.
+ 4. Dropped indexing and searching of unigram, bigram, and trigrams.
+ 5. Add length of document during indexing for improved speed via normalization calculation.
+

indexer.py

@@ -17,6 +17,8 @@ from bs4 import BeautifulSoup
 from time import perf_counter
 import time
 import threading
+from threading import Lock
+import math
 
 
 #Data process
@@ -32,187 +34,196 @@ import re
 from posting import Posting
 from worker import Worker
 
+class Node():
+	index_value = ''
+	postings = list()
+
+class Index():
+	length = 0
+	index = list()
 
 class Indexer():
-	def __init__(self,restart,trimming):
+	def __init__(self,list_partials,weight,data_paths,worker_factory=Worker):
 		#Config stuffs
-		self.path = "data/DEV/"
-		self.restart = restart
-		self.trimming = trimming
+		self.path = "data/DEV"
+		self.num_doc = 0
+		self.list_partials = list_partials
+		self.weight = weight
+		self.data_paths = data_paths
 		self.stemmer = PorterStemmer()
-
-		#Shelves for index
-		#https://www3.nd.edu/~busiforc/handouts/cryptography/letterfrequencies.html
-		#https://www.irishtimes.com/news/science/how-many-numbers-begin-with-a-1-more-than-30-per-cent-1.4162466
-		#According to this will be how we split things
-		#Save #1 = ABCD + (1) ~ 18.3% of words
-		#Save #2 = EFGHIJK + (2-3)~ 27.1% of words
-		#Save #3 = LMNOPQ + (4-7) ~ 25.4% of words
-		#Save #4 = RSTUVWXYZ + (8-9)~ 29.2% of words
-		#Save #5 = Special characters
-		if os.path.exists("save_1.shelve") and restart:
-			os.remove("save_1.shelve")
-		if os.path.exists("save_2.shelve") and restart:
-			os.remove("save_2.shelve")
-		if os.path.exists("save_3.shelve") and restart:
-			os.remove("save_3.shelve")
-		if os.path.exists("save_4.shelve") and restart:
-			os.remove("save_4.shelve")
-		if os.path.exists("save_5.shelve") and restart:
-			os.remove("save_5.shelve")
+		self.data_paths_lock = Lock()
+		self.list_partials_lock = Lock()
+		
+		self.workers = list()
+		self.worker_factory = worker_factory
 
 
-		self.save_1 = shelve.open("save_1.shelve")
-		self.save_1_lock = threading.Lock()
-		self.save_2 = shelve.open("save_2.shelve")
-		self.save_2_lock = threading.Lock()
-		self.save_3 = shelve.open("save_3.shelve")
-		self.save_3_lock = threading.Lock()
-		self.save_4 = shelve.open("save_4.shelve")
-		self.save_4_lock = threading.Lock()
-		self.save_5 = shelve.open("save_5.shelve")
-		self.save_5_lock = threading.Lock()
+	def start_async(self):
+		self.workers = [
+			self.worker_factory(worker_id,self)
+			for worker_id in range(8)]
+		for worker in self.workers:
+			worker.start()
 
-		print(len(list(self.save_1.keys())))
-		print(len(list(self.save_2.keys())))
-		print(len(list(self.save_3.keys())))
-		print(len(list(self.save_4.keys())))
-		print(len(list(self.save_5.keys())))
+	def start(self):
+		self.start_async()
+		self.join()
 
-	def save_index(self,word,posting):
-		cur_save = self.get_save_file(word)
-		lock = self.get_save_lock(word)
-		lock.acquire()
-		shelve_list = list()
-		try:
-			shelve_list = cur_save[word]
-			shelve_list.append(posting)
-			tic = perf_counter()
-			shelve_list.sort(key=lambda x: x.tf_idf, reverse = True)
-			toc = perf_counter()
-			if toc - tic > 1 :
-				print("Took " + str(toc - tic) + "seconds to sort shelve list !")
-			cur_save.sync()
-			lock.release()
-		except:
-			shelve_list.append(posting)
-			cur_save[word] = shelve_list
-			cur_save.sync()
-			lock.release()
-
-	def get_save_file(self,word):
-		#return the correct save depending on the starting letter of word
-		word_lower = word.lower()
-
-		if re.match(r"^[a-d0-1].*",word_lower):
-			return self.save_1
-		elif re.match(r"^[e-k2-3].*",word_lower):
-			return self.save_2
-		elif re.match(r"^[l-q4-7].*",word_lower):
-			return self.save_3
-		elif re.match(r"^[r-z8-9].*",word_lower):
-			return self.save_4
-		else:
-			print(word)
-			print("You have somehow went beyond the magic")
-			return self.save_5
-	def get_save_lock(self,word):
-		word_lower = word.lower()
-		if re.match(r"^[a-d0-1].*",word_lower):
-			return self.save_1_lock
-		elif re.match(r"^[e-k2-3].*",word_lower):
-			return self.save_2_lock
-		elif re.match(r"^[l-q4-7].*",word_lower):
-			return self.save_3_lock
-		elif re.match(r"^[r-z8-9].*",word_lower):
-			return self.save_4_lock
-		else:
-			print(word)
-			print("You have somehow went beyond the magic")
-			return self.save_5_lock.acquire()
-	# I have a test file (mytest.py) with pandas but couldn't figure out how to grab just a single cell.
-	# so I came up with this, if anyone knows how to get a single cell and can explain it to
-	# me I would love to know, as I think that method might be quicker, maybe, idk it like
-	# 4am
-	# https://stackoverflow.com/questions/34449127/sklearn-tfidf-transformer-how-to-get-tf-idf-values-of-given-words-in-documen
-
-	# Andy: added paramenter imporant_words in order to do multiplication of score
-	def get_tf_idf(self,words,word, important_words):
-		#tf_idf
-		#words = whole text
-		#word the word we finding the score for
-		#return the score
-		try:
-			tfidf = TfidfVectorizer()
-			tfidf_matrix = tfidf.fit_transform(words)
-			df = pd.DataFrame(tfidf_matrix.toarray(), columns = tfidf.get_feature_names_out())
-			score = df.iloc[0][''.join(word)]
-			for k,v in important_words.items():
-				if k == 'b' and word in v:
-					score = score * 1.2
-				elif k == 'h1' and word in v:
-					score = score * 1.75
-				elif k == 'h2' and word in v:
-					score = score * 1.5
-				elif k == 'h3' and word in v:
-					score = score * 1.2
-				elif k == 'title' and word in v:
-					score = score * 2
-			return(score)
-			#print(df)
-		except KeyError: 
-			return -1
+	def join(self):
+		for worker in self.workers:
+			worker.join()
 
 
-	def get_data(self):
+	def get_postings(self,index):
+		merged_index_index = open("merged_index.index" ,'r')
+		merged_index = open("merged_index.full",'r')
+		merged_index_index.seek(0,0)
+		json_value = merged_index_index.readline()
+		data = json.loads(json_value)
+		index_index = dict(data['index'])
+		to_seek = index_index[index]
+		merged_index.seek(to_seek,0)
+		json_value = merged_index.readline()
+		data = json.loads(json_value)
+		return data['postings']
 
-		num_threads = 8
-		threads = list()
+	def set_weight(self):
+		weight_file = open('docs.weight','w')
+		jsonStr =json.dumps(self.weight, default=lambda o: o.__dict__,sort_keys=False)
+		weight_file.write(jsonStr)
+		weight_file.close()
 
+	def get_weight(self,doc_id):
+		weight = open('docs.weight','r')
+		weight.seek(0,0)
+		json_value = weight.readline()
+		data = json.loads(json_value)
+		return data[doc_id]
+
+	def get_data_path(self):
 		for directory in os.listdir(self.path):
 			for file in os.listdir(self.path + "/" + directory + "/"):
-				#Actual files here
-				#JSON["url"] = url of crawled page, ignore fragments
-				#JSON["content"] = actual HTML
-				#JSON["encoding"] = ENCODING
-				index = 0
-				while True:
-					file_path = self.path + "" + directory + "/"+file
-					if len(threads) < num_threads:
-						thread = Worker(self,file_path)
-						threads.append(thread)
-						thread.start()
-						break
-					else:
-						if not threads[index].is_alive():
-							threads[index] = Worker(self,file_path)
-							threads[index].start()
-							break
-						else:
-							index = index + 1
-							if(index >= num_threads):
-								index = 0
-							time.sleep(.1)
+				self.data_paths.append("data/DEV/" + directory + "/"+file)
+		self.num_doc = len(self.data_paths)
+
+	def get_next_file(self):
+		self.data_paths_lock.acquire()
+		try:
+			holder = self.data_paths.pop()
+			self.data_paths_lock.release()
+			return holder
+		except IndexError:
+			self.data_paths_lock.release()
+			return None
 	
+	def add_partial_index(self,partial_index):
+		self.list_partials_lock.acquire()
+		self.list_partials.append(partial_index)
+		self.list_partials_lock.release()
+
 	#Found 55770 documents
 	#
+	#getting important tokens
 
-				#getting important tokens
-				
-						
-
+	def merge(self):
+		partial_files = list()
+		partial_index_files = list()
+		parital_index_indices = list()
 		
+		num_indices = len(self.list_partials)
 
+		#Full Index.Index and Length
+		full_index = Index()
+		full_index.index = list()
+		full_index.length = 0
 
+		for partial_index in self.list_partials:
+			file = open("temp/" + partial_index+'.partial','r')
+			partial_files.append(file)
+			index = open("temp/" + partial_index+'.index','r')
+			partial_index_files.append(index)
 
+		for partial_index_file in partial_index_files:
+			partial_index_file.seek(0,0)
+			parital_index_indices.append(json.loads(partial_index_file.readline()))
+
+		#Start all indexes at 0
+		for partial_file in partial_files:
+			partial_file.seek(0,0)
+
+		pointers = [0]*num_indices
+		merged_index = open("merged_index.full",'w')
+		merged_index_index = open("merged_index.index" ,'w')
+
+		while(True):
+
+			#Get all values from all indices to find min
+			value = None
+			values = list()
+			for i in range(num_indices):
+				if pointers[i] < parital_index_indices[i]['length']:
+					values.append(parital_index_indices[i]['index'][pointers[i]][0])
 				
+			if(len(values) == 0):
+				break
+			value = min(values)
 
+			#Get data from the min value of all indices if exists then save to mergedIndex
+			if value == None:
+				print("I have crashed some how by not getting min value")
+				break
 
+			node = Node()
+			node.index_value = value
+			for i in range(num_indices):
+				if pointers[i] < parital_index_indices[i]['length'] and parital_index_indices[i]['index'][pointers[i]][0] == value:
+					to_seek = parital_index_indices[i]['index'][pointers[i]][1]
+					partial_files[i].seek(to_seek,0)
+					json_value = partial_files[i].readline()
+					temp_node = json.loads(json_value)
+					node.postings = node.postings + temp_node['postings']
+					pointers[i] = pointers[i] + 1
+			#Change postings here with tf*idf idf = log (n/df(t)) 
+			node.postings.sort(key=lambda y:y['doc_id'])
+			for posting in node.postings:
+				posting['tf_idf'] = posting['tf_raw']*math.log(self.num_doc/len(node.postings))
+			full_index.index.append((value,merged_index.tell()))
+			full_index.length = full_index.length + 1
+			jsonStr = json.dumps(node,default=lambda o: o.__dict__,sort_keys=False)
+			merged_index.write(jsonStr + '\n')
+
+		full_index.index.sort(key=lambda y:y[0])
+		jsonStr =json.dumps(full_index, default=lambda o: o.__dict__,sort_keys=False)
+		merged_index_index.write(jsonStr)
+
+		for partial_index in self.list_partials:
+			os.remove("temp/" + partial_index+'.partial')
+			os.remove("temp/" + partial_index+'.index')
+
+		merged_index_index.close()
+		merged_index.close()
 
 
 def main():
-	indexer = Indexer(True,0)
-	indexer.get_data()
+	indexer = Indexer(list(),dict(),list())
+	indexer.get_data_path()
+	print("We have " + str(len(indexer.data_paths)) + " documents to go through !" )
+	indexer.start()
+	indexer.merge()
+	print("Finished merging into 1 big happy family")
+	indexer.set_weight()
+
+	tic = time.perf_counter()
+	indexer.get_postings('artifici')
+	toc = time.perf_counter()
+	print(f"Took {toc - tic:0.4f} seconds to get postings for artifici")
+	tic = time.perf_counter()
+	indexer.get_weight('00ba3af6a00b7cfb4928e5d234342c5dc46b4e31714d4a8f315a2dd4d8e49860')
+	print(f"Took {toc - tic:0.4f} seconds to get weight for some random page ")
+	toc = time.perf_counter()
+
+	
+
 
 if __name__ == "__main__":
 	main()

mytest.py

@@ -4,6 +4,7 @@ from sklearn.feature_extraction.text import TfidfVectorizer
 import pandas as pd
 import numpy as np
 
+
 #tf_idf
 #words = whole text
 #word the word we finding the score for
@@ -19,13 +20,12 @@ words = ['this is the first document '
 doc1 = ["I can't fucking take it any more. Among Us has singlehandedly ruined my life. The other day my teacher was teaching us Greek Mythology and he mentioned a pegasus and I immediately thought 'Pegasus? more like Mega Sus!!!!' and I've never wanted to kms more. I can't look at a vent without breaking down and fucking crying. I can't eat pasta without thinking 'IMPASTA??? THATS PRETTY SUS!!!!' Skit 4 by Kanye West. The lyrics ruined me. A Mongoose, or the 25th island of greece. The scientific name for pig. I can't fucking take it anymore. Please fucking end my suffering."]
 doc2 = ["Anyways, um... I bought a whole bunch of shungite rocks, do you know what shungite is? Anybody know what shungite is? No, not Suge Knight, I think he's locked up in prison. I'm talkin' shungite. Anyways, it's a two billion year-old like, rock stone that protects against frequencies and unwanted frequencies that may be traveling in the air. That's my story, I bought a whole bunch of stuff. Put 'em around the la casa. Little pyramids, stuff like that."]
 word = 'life'
-
 try:
-    tfidf = TfidfVectorizer()
-    tfidf_matrix = tfidf.fit_transform(doc1)
+    tfidf = TfidfVectorizer(ngram_range=(3,3)) # ngram_range is range of n-values for different n-grams to be extracted (1,3) gets unigrams, bigrams, trigrams
+    tfidf_matrix = tfidf.fit_transform(words)
     df = pd.DataFrame(tfidf_matrix.toarray(), columns = tfidf.get_feature_names_out())
-    print(df.iloc[0][''.join(word)])
-    #print(df)
+    #print(df.iloc[0][''.join(word)])
+    data = df.to_dict()
 except KeyError: # word does not exist 
     print(-1)
 

posting.py

@@ -1,10 +1,17 @@
 #Posting class for indexer, will probably be more complex as we keep adding crap to it
 
 class Posting():
-	def __init__(self,url,tf_idf):
+	def __init__(self,doc_id,url,tf_raw,tf_idf,positionals):
+		self.doc_id = doc_id
 		self.url = url
+		self.tf_raw = tf_raw
 		self.tf_idf = tf_idf
-		
+		self.positionals = positionals
+	def __repr__(self):
+		return "Doc_id:" + str(self.doc_id) + " URL:" + self.url + " tf_raw:" + str(self.tf_raw) + " tf_idf:" + str(self.tf_idf) + " positionals:" + str(self.positionals)
+	def __str__(self):
+		return "Doc_id:" + str(self.doc_id) + " URL:" + self.url + " tf_raw:" + str(self.tf_raw) + " tf_idf:" + str(self.tf_idf) + " positionals:" + str(self.positionals)
+
 	def comparator(self):
 		#Some custom comparator for sorting postings later
 		pass

search.py

@@ -0,0 +1,111 @@
+#Data input
+import json
+import os
+import shelve
+from bs4 import BeautifulSoup
+from time import perf_counter
+import time
+import threading
+import pickle
+
+
+#Data process
+from nltk.tokenize import word_tokenize
+from nltk.stem import PorterStemmer
+from sklearn.feature_extraction.text import TfidfVectorizer
+import pandas as pd
+import numpy as np
+
+import re
+
+#Logging postings
+from posting import Posting
+from worker import Worker
+
+class Search():
+    # wrote the code for testing in the file searchtesting.py so many of the variables and function calls are wrong.
+    def __init__(self):
+        self.stemmer = PorterStemmer()
+        p = os.path.dirname(os.path.abspath(__file__))
+        my_filename = os.path.join(p, "urlID.pkl")
+        self.f = open(my_filename, "rb+")
+        self.id = pickle.load(self.f)
+
+    # takes a list of posting lists returns a list of indexes that correspond to search temp list
+    def two_shortest(self, l_posting):
+        short = []
+        location = []
+        for postings in l_posting:
+            short.append(len(postings))
+        
+        for i in range(2):
+            x = short.index(min(short))
+            location.append(x)
+            short[x] = float('inf')
+        
+        return location
+
+    # len(list1) <= len(list2) So the code in this function works with that in mind
+    def merge(self, list1, list2):
+        merged = []
+        i = 0
+        j = 0
+        # TODO: optimize by having a pointer to the current index+4
+        while i < len(list1) or j < len(list2):
+            if j == len(list2):
+                break
+            if i == len(list1):
+                break
+            # Since list1 is shorter it will hit its max index sooner, 
+            #   so in the cases were it does we still need to go through list2 to see if the last element of list1 appears anywhere in the rest of list2
+            if i == len(list1)-1:
+                if list1[i].url == list2[j].url:
+                    merged.append(list1[i])
+                    j += 1
+                    i += 1
+                elif list1[i].url < list2[j].url:
+                    break
+                else:
+                    j += 1
+            else:
+                if list1[i].url == list2[j].url:
+                    merged.append(list1[i])
+                    i += 1
+                    j += 1
+                elif list1[i].url < list2[j].url:
+                    break
+                else:
+                    i += 1
+                    j += 1
+        return merged
+
+    # query is a list of stemmed tokens, returns a list of postings (which we'll directly ignore except for the doc id)
+    def search(self, query):
+        temp = []
+        for token in query:
+            temp.append(get_index(token))
+        
+        l = two_shortest(temp)
+        m = merge(temp[l[0]], temp[l[1]])
+
+        while len(temp) > 1:
+            # delete from temp the already merged lists
+            del temp[l[0]]
+            del temp[l[1]]
+            temp.append(m)
+
+            l = two_shortest(temp)
+            m = merge(temp[l[0]], temp[l[1]])
+
+        for p in m:
+            print(p.url)
+        
+        # For now going to do a loop through each query's index and match it with the merged list (can be faster if i implement something during merge/search in order to keep track of the postings)
+
+
+
+
+
+
+
+

searchtesting.py

@@ -0,0 +1,117 @@
+import math
+import json
+import os
+import shelve
+from bs4 import BeautifulSoup
+from time import perf_counter
+import time
+import threading
+import pickle
+
+
+#Data process
+from nltk.tokenize import word_tokenize
+from nltk.stem import PorterStemmer
+from sklearn.feature_extraction.text import TfidfVectorizer
+import pandas as pd
+import numpy as np
+
+import re
+
+class Posting():
+	def __init__(self, url, rtf, position):
+		self.url = url
+		self.rtf = rtf
+		self.tf = 1
+		self.tfidf = 0
+		self.positions = [position]
+
+
+d = {
+    'a' : [Posting(0, 1, 1), Posting(2, 1, 1), Posting(3, 1, 1), Posting(8, 1, 1)], 
+    'b' :[Posting(0, 1, 1), Posting(8, 1, 1)],
+    'c' : [Posting(0, 1, 1), Posting(1, 1, 1), Posting(2, 1, 1), Posting(8, 1, 1)]
+    }
+
+def get_index(word):
+    for k, v in d.items():
+        if k == word:
+            return v
+
+# takes a list of posting lists returns a list of indexes that correspond to search temp list
+def two_shortest(l_posting):
+    short = []
+    location = []
+    for postings in l_posting:
+        short.append(len(postings))
+    
+    for i in range(2):
+        x = short.index(min(short))
+        location.append(x)
+        short[x] = float('inf')
+    
+    return location
+
+# len(list1) <= len(list2) So the code in this function works with that in mind
+def merge(list1, list2):
+    merged = []
+    i = 0
+    j = 0
+    # TODO: optimize by having a pointer to the current index+4
+    while i < len(list1) or j < len(list2):
+        if j == len(list2):
+            break
+        if i == len(list1):
+            break
+        # Since list1 is shorter it will hit its max index sooner, 
+        #   so in the cases were it does we still need to go through list2 to see if the last element of list1 appears anywhere in the rest of list2
+        if i == len(list1)-1:
+            if list1[i].url == list2[j].url:
+                merged.append(list1[i])
+                j += 1
+                i += 1
+            elif list1[i].url < list2[j].url:
+                break
+            else:
+                j += 1
+        else:
+            if list1[i].url == list2[j].url:
+                merged.append(list1[i])
+                i += 1
+                j += 1
+            elif list1[i].url < list2[j].url:
+                break
+            else:
+                i += 1
+                j += 1
+    return merged, 
+
+# query is a list of stemmed tokens, returns a list of postings (which we'll directly ignore except for the doc id)
+def search(query):
+    temp = []
+    for token in query:
+        temp.append(get_index(token))
+    
+    l = two_shortest(temp)
+    m = merge(temp[l[0]], temp[l[1]])
+
+    while len(temp) > 1:
+        # delete from temp the already merged lists
+        del temp[l[0]]
+        del temp[l[1]]
+        temp.append(m)
+
+        l = two_shortest(temp)
+        m = merge(temp[l[0]], temp[l[1]])
+
+    for p in m:
+        print(p.url)
+    
+    # For now going to do a loop through each query's index and match it with the merged list (can be faster if i implement something during merge/search in order to keep track of the postings)
+    
+    
+
+
+
+search(["a", "b", "c"])
+            

stemmer.py

@@ -1,18 +0,0 @@
-#Multiple implementation of stemming here please
-class Stemmer():
-
-	def __init__(self,mode, data):
-		#Different type of stemmer = different modes
-		self.mode = mode
-		self.data = data
-
-	def stem(self):
-		#Do stuff here
-		if(self.mode == 0):
-			#Do stemmer 1
-			return #stemmed data
-		#....
-
-	def #name of stemmer 1
-
-	def #name of stemmer 2

test.py

@@ -1,17 +1,13 @@
-import re
+from threading import Thread
+import json
 import os
+import shelve
+import sys
+from bs4 import BeautifulSoup
+from time import perf_counter
+from nltk.stem import PorterStemmer
+import nltk
+import time
+from posting import Posting
 
-for i in range(99):
-	word_lower = chr(i % 26 + 97) + chr(i % 26 + 97 + 1)
-	print(word_lower)
-	if re.match(r"^[a-d1-1].*",word_lower):
-		print("SAVE 1")
-	elif re.match(r"^[e-k2-3].*",word_lower):
-		print("SAVE 2")
-	elif re.match(r"^[l-q4-7].*",word_lower):
-		print("SAVE 3")
-	elif re.match(r"^[r-z8-9].*",word_lower):
-		print("SAVE 4")
-
-path = "data/DEV/"
-print(os.listdir(path))
+import re

test_merge.py

@@ -0,0 +1,116 @@
+import json
+from posting import Posting
+import math
+import sys
+import random
+from nltk.corpus import words
+random_list = [1,2,3,4,5,6,7,8,9,10]
+
+
+test_data = words.words()
+random.shuffle(test_data)
+
+
+def random_posting(id):
+	return Posting(id,random.choice(random_list),random.choice(random_list),[random.choice(random_list),random.choice(random_list),random.choice(random_list),random.choice(random_list),
+	random.choice(random_list),random.choice(random_list),random.choice(random_list),random.choice(random_list)])
+
+class Node():
+	index_value = 'Something'
+	postings = list()
+
+class Index():
+	length = 0
+	index = list()
+
+def random_partial_index(name):
+	part_index = Index()
+	part_index.index = list()
+	part_index.length = 0
+	with open(name +'.partial', 'w') as f:
+		for i in range(1000):
+
+			node1 = Node()
+			node1.index_value = random.choice(test_data).lower()
+			node1.postings = list()
+			for i in range(10):
+				node1.postings.append(random_posting(i))
+
+			jsonStr = json.dumps(node1, default=lambda o: o.__dict__,sort_keys=False)
+			
+			part_index.index.append((node1.index_value,f.tell()))
+			f.write(jsonStr + '\n')
+			part_index.length = part_index.length + 1
+
+	part_index.index.sort(key=lambda y:y[0])
+	jsonStr =json.dumps(part_index, default=lambda o: o.__dict__,sort_keys=False)
+	with open(name + '.index','w') as f:
+		f.write(jsonStr)
+
+def merge(partial_indices):
+	partial_files = list()
+	partial_index_files = list()
+	parital_index_indices = list()
+	merged_index = open("merged_index.full",'w')
+	num_indices = len(partial_indices)
+
+	#Full Index.Index and Length
+	full_index = Index()
+	full_index.index = list()
+	full_index.length = 0
+
+	for partial_index in partial_indices:
+		file = open(partial_index+'.partial','r')
+		partial_files.append(file)
+		index = open(partial_index+'.index','r')
+		partial_index_files.append(index)
+
+	for partial_index_file in partial_index_files:
+		partial_index_file.seek(0,0)
+		parital_index_indices.append(json.loads(partial_index_file.readline()))
+
+	#Start all indexes at 0
+	for partial_file in partial_files:
+		partial_file.seek(0,0)
+
+	pointers = [0]*num_indices
+
+	while(True):
+
+		#Get all values from all indices to find min
+		value = None
+		values = list()
+		for i in range(num_indices):
+			if pointers[i] < parital_index_indices[i]['length']:
+				values.append(parital_index_indices[i]['index'][pointers[i]][0])
+			
+		if(len(values) == 0):
+			break
+		value = min(values)
+
+		#Get data from the min value of all indices if exists then save to mergedIndex
+		if value == None:
+			print("I have crashed some how by not getting min value")
+			break
+
+		node = Node()
+		node.index_value = value
+		for i in range(num_indices):
+			if pointers[i] < parital_index_indices[i]['length'] and parital_index_indices[i]['index'][pointers[i]][0] == value:
+				to_seek = parital_index_indices[i]['index'][pointers[i]][1]
+				partial_files[i].seek(to_seek,0)
+				json_value = partial_files[i].readline()
+				temp_node = json.loads(json_value)
+				node.postings = node.postings + temp_node['postings']
+				pointers[i] = pointers[i] + 1
+		
+		node.postings.sort(key=lambda y:y['doc_id'])
+		full_index.index.append((value,merged_index.tell()))
+		full_index.length = full_index.length + 1
+		jsonStr = json.dumps(node,default=lambda o: o.__dict__,sort_keys=False)
+		merged_index.write(jsonStr + '\n')
+
+	full_index.index.sort(key=lambda y:y[0])
+	jsonStr =json.dumps(full_index, default=lambda o: o.__dict__,sort_keys=False)
+	with open("merged_index.index" ,'w') as f:
+		f.write(jsonStr)

worker.py

@@ -1,109 +1,137 @@
 from threading import Thread
 import json
 import os
-import shelve
-from bs4 import BeautifulSoup
-from time import perf_counter
-import time
 
+from bs4 import BeautifulSoup
 import re
 
 
 #Data process
 from nltk.tokenize import word_tokenize
 from nltk.stem import PorterStemmer
-from sklearn.feature_extraction.text import TfidfVectorizer
-import pandas as pd
-import numpy as np
-from collections import Counter
 
 from posting import Posting
 
+import math
 
 import sys
 
+class Node():
+	index_value = ''
+	postings = list()
+
+class Index():
+	length = 0
+	index = list()
+
 class Worker(Thread):
-	def __init__(self,indexer,target):
-		self.file = target
+	def __init__(self,worker_id,indexer):
 		self.indexer = indexer
+		self.stemmer = PorterStemmer()
+		self.worker_id = worker_id
+		self.num_partial = 0
+		self.index = dict()
 		super().__init__(daemon=True)
 
+	def dump(self):
+		part_index = Index()
+		part_index.length = 0
+		part_index.index = list()
+
+		cur_partial_index_str = "temp/" + str(self.worker_id) + "_" + str(self.num_partial) + '.partial'
+		cur_partial_index_index_str = "temp/" +  str(self.worker_id) + "_" + str(self.num_partial) + '.index'
+
+
+		cur_partial_index = open(cur_partial_index_str,'w')
+		cur_partial_index_index = open(cur_partial_index_index_str,'w')
+
+		for key in self.index:
+			node = Node()
+			node.index_value = key
+			node.postings = self.index[key]
+
+			jsonStr = json.dumps(node, default=lambda o: o.__dict__,sort_keys=False)
+
+			part_index.index.append((node.index_value,cur_partial_index.tell()))
+			cur_partial_index.write(jsonStr + '\n')
+			part_index.length = part_index.length + 1
+
+		part_index.index.sort(key=lambda y:y[0])
+		jsonStr =json.dumps(part_index, default=lambda o: o.__dict__,sort_keys=False)
+		cur_partial_index_index.write(jsonStr)
+
+		self.indexer.add_partial_index(str(self.worker_id) + "_" + str(self.num_partial))
+		self.num_partial = self.num_partial + 1
+		self.index.clear()
+
+
 	def run(self):
-		print("Target: " + str(self.file))
-		ticker = perf_counter()
-		tic = perf_counter()
-		file_load = open(self.file)
-		data = json.load(file_load)
-		soup = BeautifulSoup(data["content"],features="lxml")
-		words = word_tokenize(soup.get_text())
-		toc = perf_counter()
-		if toc - tic > 1 :
-			print("Took " + str(toc - tic) + "seconds to tokenize text !")
+		while True:
+			target = self.indexer.get_next_file()
+			if not target:
+				self.dump()
+				print("Worker " + str(self.worker_id) + " died")
+				break
+			file_load = open(target)
+			data = json.load(file_load)
+			soup = BeautifulSoup(data["content"],features="lxml")
+			doc_id = target[target.rfind('/')+1:-5]
+			url = data['url']
+			print("Worker " + str(self.worker_id) + " working on " + url)
+			important = {'b' : [], 'h1' : [], 'h2' : [], 'h3' : [], 'title' : []}
+			for key_words in important.keys():
+				for i in soup.findAll(key_words):
+					for word in word_tokenize(i.text):
+						important[key_words].append(self.stemmer.stem(word))
+
+			# Gets a cleaner version text comparative to soup.get_text()
+			clean_text = ' '.join(soup.stripped_strings)
+			# Looks for large white space, tabbed space, and other forms of spacing and removes it
+			# Regex expression matches for space characters excluding a single space or words
+			clean_text = re.sub(r'\s[^ \w]', '', clean_text)
+			# Tokenizes text and joins it back into an entire string. Make sure it is an entire string is essential for get_tf_idf to work as intended
+			clean_text = " ".join([i for i in clean_text.split() if i != "" and re.fullmatch('[A-Za-z0-9]+', i)])
+			# Stems tokenized text
+			clean_text = " ".join([self.stemmer.stem(i) for i in clean_text.split()])
+			# Put clean_text as an element in a list because get_tf_idf workers properly with single element lists
+
+			tokens = word_tokenize(clean_text)
+
+			#counter(count,positionals)
+
+			counter = dict()
+			#We calculating tf_raw, and positionals here
+			for i in range(len(tokens)):
+				word = tokens[i]
+				if word in counter:
+					counter[word][0] = counter[word][0] + 1
+					counter[word][1].append(i)
+				else:
+					counter[word] = [1,list()]
+					counter[word][1].append(i)
+
+			doc_length = len(tokens)
+			total = 0
+			for index in counter:
+				tf = counter[index][0]/doc_length
+				log_tf = 1 + math.log(tf)
+				total = total + log_tf * log_tf
+				if index in self.index:
+					postings = self.index[index]
+					postings.append(Posting(doc_id,url,tf,0,counter[index][1]))
+				else:
+					self.index[index] = list()
+					self.index[index].append(Posting(doc_id,url,tf,0,counter[index][1]))
+					self.index[index].sort(key=lambda y:y.doc_id)
+
+			self.indexer.weight[doc_id] = math.sqrt(total)
+
+			#10 Megabytes index (in Ram approx)
+			if sys.getsizeof(self.index) > 1000000:
+				self.dump()
 
-		tokenized_words = list()
-		stemmed_words = list()
 
-		important = {'b' : [], 'h1' : [], 'h2' : [], 'h3' : [], 'title' : []}
-		for key_words in important.keys():
-			for i in soup.findAll(key_words):
-				for word in word_tokenize(i.text):
-					important[key_words].append(self.indexer.stemmer.stem(word))
 
-		tic = perf_counter()
-		for word in words:
-			if word != "" and re.fullmatch('[A-Za-z0-9]+',word):
-				#So all the tokenized words are here,
-				tokenized_words.append(word)
-		toc = perf_counter()
-		if toc - tic > 1 :
-			print("Took " + str(toc - tic) + "seconds to isalnum text !")
-		#YOUR CODE HERE
 
-		tic = perf_counter()
-		for word in tokenized_words:
-			stemmed_words.append(self.indexer.stemmer.stem(word))
-			#stemming,
-			#tf_idf
-			#get_tf_idf(stemmed_words,word)
-			#post = Posting()
-		toc = perf_counter()
-		if toc - tic > 1 :
-			print("Took " + str(toc - tic) + "seconds to stemmed text !")
 
-		counts = Counter(stemmed_words)
-		size = len(stemmed_words)
-		for word in counts:
-			#posting = Posting(data["url"],self.get_tf_idf(list(' '.join(stemmed_words)),word))
-			tic = perf_counter()
-			weight = 1.0
-			index = 0
-			"""
-			for group in important:
-				for word_important in group:
-					if word_important.lower() == word.lower():
-						if index == 0:
-							weight = 1.2
-						elif index == 1:
-							weight = 1.8
-						elif index == 2:
-							weight = 1.5
-						elif index == 3:
-							weight = 1.3
-						elif index == 4:
-							weight = 2.0
-				index = index + 1
-			"""
 			
-			posting = Posting(data["url"],counts[word]/size*weight)
-			toc = perf_counter()
-			if toc - tic > 1 :
-				print("Took " + str(toc - tic) + "seconds to tf_idf text !")
-
-			tic = perf_counter()
-			self.indexer.save_index(word,posting)
-			toc = perf_counter()
-			if toc - tic > 1 :
-				print("Took " + str(toc - tic) + "seconds to save text !")
-
-		tocker = perf_counter()
-		print("Finished " + data['url'] + "\n" + str(tocker-ticker))