Framework for Product Recommandation for Review Dataset

International Journal on Recent and Innovation Trends in Computing and Communication ISSN: 2321-8169
Volume: 5 Issue: 7 324 – 330
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IJRITCC | July 2017, Available @ http://www.ijritcc.org
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Framework for Product Recommandation for Review Dataset
Kaki Sudheshna
Student,Dept of IT
Shri Vishnu Engineering College for Women
Bhimavaram, Andhra Pradesh, India
Achutuni Indraja
Student ,Dept of IT
Arumilli Bala Sushma Sri
Student ,Dept of IT
S.Adinarayana
Assoc Professor ,Dept of IT
Abstract: In the social networking era, product reviews have a significant influence on the purchase decisions of customers so the market has
recognized this problem The problem with this is that the customers do not know how these systems work which results in trust issues.
Therefore a different system is needed that helps customers with their need to process the information in product reviews. There are different
approaches and algorithms of data filtering and recommendation .Most existing recommender systems were developed for commercial domains
with millions of users. In this paper we have discussed the recommendation system and its related research and implemented different techniques
of the recommender system .
Keywords – Recommendation, product, review, rating matrix, consumer, collaborative filtering, recommenderlab
__________________________________________________*****_________________________________________________
I. INTRODUCTION
In this paper, we are going to study about recommendation [1]
systems. Recommendation systems are typically used by
companies; especially e-commerce companies like
Amazon.com, to help users discover items they might not have
found by themselves and promote sales to potential customers.
A good recommendation system can provide customers with
the most relevant products [2]. This is a highly-targeted
approach which can generate high conversion rate and make it
very effective and smooth to do advertisements. So the
problem we are trying to study here is that, how to build
effective recommendation systems that can predict products
that customers like the most and have the most potential to
buy. Based on the research on some existing models and
algorithms, we make application-specific improvements on
them and then design three new recommendation systems,
Item Similarity, Bipartite Projection and Spanning Tree. They
can be used to predict the rating for a product that a customer
has never reviewed, based on the data of all other users and
their ratings in the system. We implement these three
algorithms, and then test them on some existing datasets to do
comparisons and generate results.
II. FUNCTIONALITY OF THE RECOMMENDER SYSTEM
FRAMEWORK
The proposed system supports collaboration between persons
in a software environment. Only collaborations performed
through synchronous interactions are supported. The main
goal of the system is to recommend items to participants of
discussions. To do that, the system needs to recognize the
context of the discussion or the theme being dealt, analyzing
the messages exchange in a software tool like an Internet
chats. The system recommends items from a digital base
classified in the same subject of the discussion (context or
theme). Figure1 presents an overview of the system
architecture, detailing its main components and some
interfaces. The first module is the Session Analyzer,
responsible for identifying the subject of the discussion. This
is made using a Text Mining tool that analyzes texts in the
messages exchanged in the chat tool. A thesaurus should be
defined to represent the subjects possible to be discussed
(including an hierarchy of the subjects). The thesaurus also
contains the terms used to express those subjects in the written
language. This thesaurus is specific to the local environment
and needs to be defined by people of the environment using
automatic and manual methods, e.g., [Ch96]. The
recommender module receives the current subject of the
discussion and selects items from a digital base to suggest for
the discussion participants. It is possible to exist more than one
subject in the same session, as will be explained later. The
recommendation [1] intends to accomplish the knowledge
reuse, suggesting to the participants information or solutions
that were useful to other persons of the software environment.
To do that, the system has to store a knowledge base that will
be maintained by people of the organization. The environment
personnel must add items to the digital base, classified in
subjects according to the thesaurus.

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A. Product reviews
Every message sent by a participant in a discussion session
will be analyzed to find keywords. Keywords represent
subjects as defined in the thesaurus. The text classification
method is based on Rocchio‟s[11] and Bayes‟ algorithms. The
method analyzes the context of the words and not only the
presence of keywords, eliminating ambiguities. There is a
subject pointer, indicating what subject of those in the
thesaurus is the current one being discussed. The pointer
navigates over the thesaurus structure as different subjects are
being dealt[12]. The list of subjects discussed in a session will
be stored in the discussion history for later analyses.
Figure 1. Recommendation Framework
B. Review Preprocessing
Before starting the Feature extraction process, a pre-
processing phase is needed, in order to prepare the text for
further processing. First of all, the input text is split into
sentences, and each sentence is then analyzed by a Part-of-
Speech Tagger. The following algorithmic steps best describes
preprocessing the reviews.
Step 1: Identify Frequent nouns
Step 2: Identify Relevant nouns
Step 2.1 - Identify Adjectives
Step 2.2 - Identify New candidate features i.e nouns
Step 3: Map the Feature indicators
Step 4: Remove Unrelated nouns
C. Feature extraction
A “product feature” or “product aspect” is a component or an
attribute of a certain product. For example, features of camera
resolution of a smart phone ,battery life and screen size of a
mobile etc,. A product may have a lot of features, some being
more important for customers when making a buying decision
than others. Bafna and Toshiwal (2013) on the other hand use
a probabilistic approach to improve the feature extraction with
the assumption that nouns and noun phrases corresponding to
product features of a given domain have a higher probability
of occurrence in a document of the this domain than in a
document of another domain.
D. .Sentiment Analysis
Sentiment analysis takes input from feature extraction phase, It
will detect whether a review text represents a positive or
negative (or neutral) opinion[7]. An “opinion” is a sentiment,
view, attitude, emotion or appraisal about an entity such as a
product, a person or a topic or an aspect of that entity from a
user or a group of users.
E. Summarization
After identifying sentiment polarity in previous phase, it will
create a smaller version of a review document that retains the
most important information of the source.[8] “Automated text
summarization aims at providing a condensed representation
of the content according to the information that the user wants
to get. But the problem with this is, that “it is still difficult to
teach software to analyze semantics and to interpret meaning.
A new way to solve this issue by taking into consideration the
distance of each opinion word with respect to product feature
and then calculating the overall opinion of the sentence. This
turns out to be highly useful. Summarization of the reviews is
done by extracting the relevant excerpts with respect to each
feature-opinions pair and placing it into their respective
feature based cluster.
F. Recommendation
Recommendation technique has been widely discussed in the
research communities of information retrieval, data mining,
and machine learning. Due to all these values the
recommendation system is commercially successful to do
product, movie and other recommendations. We proposed a
framework where we can get genuine rating from the customer
feedback. The existing system also has the same features of
proposed system but we tried to implement some concepts to
overcome from a number of problems which the existing
system has.
III. SOURCE OF PRODUCT REVIEWS
In India we use ecommerce sites like FLIPKART,
SNAPDEAL, JUNGLEE, AMAZON, etc. These are the most
famous and the most used sites in India for shopping. Every
year BBC, TIMES OF INDIA and a few more news media
survey these ecommerce sites to know the current status of
Indian people and their mindsets. The eBay shopping mart was
started in 1995 according to a BBC survey in 2013; it says that
606 million dollars have been invested for this site. There are
33.500 employees in eBay and the revenue is 16.05 billion
dollars. Another ecommerce site is FLIPKART in India; it
started in 2007, the investment was 210 million dollars till
2013 and the survey says that most of the investors are
foreigners (BBC). After the US succeeded in ecommerce sites,
many people started investing in India in E-Business. There
are 15,000 employees working for FLIPKART and the
revenue is 1billion dollars. The business today says that
FLIPKART has 5 million products and it sells more than 600
crore products in a day.

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From these surveys we can see that most of us wish to get
products online rather than direct shopping, because it reduces
time and it is not a complex task to purchase compared to the
older method. These sites becomes an important factor in our
day-to-day life, so it is necessary to take care of things like
organizing the products in a correct domain, protecting a
customer‟s details like credit and debit card pin numbers,
interactive and attractive web pages, etc. There are many
aspects to concentrate on the ecommerce site to give better
enrichment in the process of buying a product. In this paper
we have concentrated on reviews and ratings of a product
which is a vital factor for sales. All the ecommerce sites
encourage customers to write feedback about the product to
help the customers to know about the product‟s positives and
negatives.
For example, a customer who wants to buy a Sony laptop
wants to know the feedback from the laptop users to know
which laptop is better in the market. In this case the reviews
and ratings given by the customers will be useful for him to
get best one from the pool. Hence this example reveals the
importance of feedback and rating method in the ecommerce
field. Nowadays all ecommerce sites expect comments and
ratings from the customer to correct their mistakes in the
future version of that product. Some of the websites get only
ratings from the customers. Some get the A consumer who
mostly gives the genuine and Quality reviews and ratings
from persons who own it. But we cannot say that all of us give
a very genuine rating in blogs which leads to consumers to get
confused or negative about the product. So in order to make
accurate ratings to facilitate customers we generate ratings
from the customer feedback. We could think a product from
many aspects, i.e., “price,” “Quality,” “Quantity,” and much
more. So we generate a system to analyze ratings from all the
maximum aspects which we could think as much as possible.
Most ecommerce sites expect both feedback and rating from
the customer [5] without knowing the customer‟s mentality.
Customer feels flexible in giving feedback rather than ranking
a product because when he gives feedback he will explain a
product in various aspects but in case of raking he cannot
apply this method. A customer always gives genuine feedback
than rating.
A. .Related Work
There are many works done on this framework to make ratings
[4]. They use mainly two methods called the document level
sentiment classification and extractive review summarization.
The document level sentiment classification help us to
conclude a review level documents, which is expressing a
document‟s overall opinion whether it is positive or negative.
The extractive review summarization method helps us to
generate rating by extracting useful information from the
customer feedback. They implement information retrieval
concepts to remove some words that are not needed to
calculate the rating. The project has been divided into four
stages according to the concepts that have to be implemented.
The first stage consists of stemming and stop word removal,
the second stage has opinion word extraction and extracting
common words. The third stage is clustering sentiment
analysis with classification of polarity, and finally the product
aspect ranking, document level classification, and extractive
review summarization is the fourth stage. In a paper [6] the
authors had proposed a sentiment-based rating prediction
technique within the framework of matrix factoring for
product recommendation.
From the title of the paper we understand what the paper is
about (toward the next generation of recommendation systems:
a survey of the state of the art and possible extensions). This
paper speaks elaborately about the present generation of
recommendation system and its limitations. It gives an idea to
overcome from all the limitations, how we could extend the
recommendation systems and make it available even for a
broader range of applications. These extension ideas make us
understand about the users and their point of view toward the
item they buy. They discuss the three-recommendation system
which plays a vital role in today‟s world of ecommerce to do
product recommendation. The important note in this
discussion is to make us to realize how the rating part varies in
each recommendation.
In a paper they have been compared three categories of getting
recommendation of a product. They are real world social
recommendation , social network, and the user item rating
matrix. The real-world social recommendation is all about the
direct recommendation, i.e., if a customer wants to buy a
laptop, he gets recommendation from laptop users whom he
knows. Then the social network recommendation gets
recommendation of a product from the social media like Face
book and Twitter etc. The last one is the user item rating
matrix; it is in the form of matrix by considering the items and
user‟s interest toward an item. Importance is also given to the
low rank matrix factorization.
From these three papers we understand the importance of
reviews given by the user. Each and every review and rating is
an important aspect for the inflation of a product value in the
market. We cannot generate a system to calculate a very
accurate rating because people‟s mind varies. But we can try
to produce a genuine rating from our system with the help of
customer reviews, hence in our proposed system we develop a
framework where the customer can post their feedbacks and
get the ratings .
IV. TECHNIQUES FOR RECOMMENDATION
SYSTEM
There are numerous techniques available for recommendation
system They are Content based recommendation system,
Collaborative Recommendation, Knowledge-based
recommender systems, Demographic recommender systems.
Even we can develop a hybrid system with two more
techniques.
A. Content based recommendation system
In content-based (CB) system, Ratings expressed by a single
consumer have no role in recommendations provided to other
consumers. The core of this approach is the processing of the
contents describing the items to be recommended. Content
Based approach learns a profile of the consumer interests
based on some features of the objects the consumer rated.
After the system exploits the consumer profile to suggest
suitable items by matching the profile representation against
that of items to be recommended. Content -based techniques
are limited by the features that are associated either
automatically or manually with the items. No CB system can

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provide good suggestions if the content does not contain
enough information to distinguish items the consumer likes
from items the consumer does not like. Enough ratings have to
be collected before a CB system can really understand
consumer preferences and provide accurate recommendations.
Therefore, when few ratings are available, such as for a new
consumer, the system would not be able to provide reliable
recommendations.
B. Collaborative Recommendation
The collaborative approach to recommendation is altogether
different: Rather than recommend items because they are like
things a purchaser has purchased previously, framework
prescribe things other comparative shopper have preferred.
Rather than find the similarity of the items, system find the
similarity between the consumers [5]. Often, for each
consumer a group of closest neighbor consumers is found with
whose past ratings there is the strongest relation. Scores for
unseen items are predicted based on a combination of the
scores known from the nearest neighbors. If a new item
appears in the database there is no way it can be recommended
to a consumer until more information about it is obtained
through another consumer either rating it or specifying which
other items it is similar to. Thus ,if the small number of
consumers rated the product then to recommendation very
poor because the system must form the mass comparison to
find the target consumer.
If a consumer whose tastes are unusual compared to the rest of
the population there will not be any other consumers who are
particularly similar, leading to poor recommendations.
Therefore, if one consumer liked the Zee News weather page
and another liked the NDTV weather page, then it not
necessarily both neighbors because the system must form the
mass comparison to find the target consumer. The
neighborhood is defined in terms of similarity between users,
either by taking a given number of most similar users (k
nearest neighbors) or all users within a given similarity
threshold.
C. Knowledge-based recommender systems
Knowledgebase approaches are prominent in that they have
functional knowledge: they have knowledge about how a
particular item meets a particular consumer need, and can
therefore reason about the relationship between a need and a
possible recommendation. A knowledge-based
recommendation system avoids some drawbacks. It does not
have a ramp-up problem since its recommendations do not
depend on a foundation of consumer ratings. It does not have
to collect information about a particular consumer because its
opinions are independent of individual preferences. These
characteristics make knowledgebase recommenders not only
valuable systems on their own, but also highly complementary
to other types of recommender systems. The system has the
former Knowledge about the objects being recommended and
their features and it must have the capacity to map between the
consumer‟s requirements and the object that might satisfy
those requirements consumer knowledge: To offer good
recommendations , the system must hold some knowledge
about the consumer.
D. Demographic recommender systems
Demographic recommender systems intend to categorize the
consumer based on personal attributes and make
recommendations based on demographic classes. The benefit
of this approach is that it may not oblige a history of consumer
[5] ratings like collaborative and content-based techniques.
Some recommender systems do not like to utilize the
demographic information because this form of information is
difficult to collect: Till some years ago, indeed, consumers
were unwilling to share a large quantity of personal
information with a system.
E. Hybrid Approach
Hybrid approach combines two or more techniques described
earlier in different ways to improve recommendation
performance in order to tackle the shortcoming of underlying
approaches including cold-start or data sparsity problem.
Cold-start concerns the issue that the system cannot draw any
inferences for consumers or items about which it has not yet
gathered sufficient information. Sparsity concerns the number
of ratings obtained is usually very small compared to the
number of ratings to be predicted. For example, a knowledge-
based and a collaborative system might be combined together
to achieve more robust recommender system than the
individuals components. The knowledge-based component can
overcomes the cold-start Problem with making
recommendations for new consumers whose profiles are
compact, and the Collaborative approach can help by finding
those consumers who have similar preferences in the Domain
space that no knowledge engineer could have predicted.
However, current hybrid approaches still suffer from a few
drawbacks.
First, there is insufficient contextual information to model
consumers and items and therefore weaknesses to predict
consumer taste in domains with complex objects such as
education. Finally, there is also the shortcoming in closest
neighbor based computing, Scalability problem, since the
computation time grows fast with the number of consumers
and Objects. The most common approaches that generally
used in hybrid approach are content based (CB) and
collaborative filtering (CF). Besides, hybrid recommenders
can also be sorted based on their operations into seven
different characters including weighted, switching (or
conditional), mixed, feature-based (property-based), feature
combination, cascade, and Meta level. Interested readers can
refer to and for further discussion of hybridization
Approaches.
F. Association mining
The goal of the techniques is to detect relationships or
connections between certain values of categorical variables in
large information sets. These techniques enable analysis and
researchers to uncover hidden patterns in heavy information
sets. The extraction of information about the consumers'
purchasing behavior, preferences and activities is being
implicitly accomplished, without the necessity of explicitly
calling for these into the aggregation procedure.
Recommender System utilizes a proactive methodology,
permitting the extraction of information about consumers'
communication with the items. The gathering of use
information is as a rule verifiably attained, without the need of

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an express demand from the piece of the consumers'
assessment. It allows the incremental discovering and putting
away, both of the current associations between oftentimes
bought items, as significantly as those less regularly obtained.
As a result, the RS is able to offer a list of personalized
products to each consumer , depending on the current products
he is just purchased, without the need for a history or a
minimal number purchased products .
V. IMPLEMENTATION OF RECOMMENDATION
SYSTEM ALGORITHMS
We have attempted to work our research in open source
software R[10]. In this we have observed different rating
matrices available for recommender system. The following list
is the rating matrices. This matrix containing ratings (typically
1-5 stars, etc.). A recommender is created using the creator
function Recommender(). Available recommendation methods
are stored in a registry.
[1] "ALS_realRatingMatrix"
"ALS_implicit_realRatingMatrix"
[3] "ALS_implicit_binaryRatingMatrix"
"AR_binaryRatingMatrix"
[5] "IBCF_binaryRatingMatrix"
"IBCF_realRatingMatrix"
[7] "POPULAR_binaryRatingMatrix"
"POPULAR_realRatingMatrix"
[9] "RANDOM_realRatingMatrix"
"RANDOM_binaryRatingMatrix"
[11] "RERECOMMEND_realRatingMatrix"
"SVD_realRatingMatrix"
[13] "SVDF_realRatingMatrix"
"UBCF_binaryRatingMatrix"
[15] "UBCF_realRatingMatrix"
We have used recommenderlab package here for
implementation below section.
A. Create a matrix with ratings
Step1 : create a matrix with 10x10 size
>mat <- matrix(sample(c(NA,0:5),100,
replace=TRUE, prob=c(.7,rep(.3/6,6))),
nrow=10, ncol=10, dimnames = list(
user=paste('u', 1:10, sep=''),
item=paste('i', 1:10, sep='')
))
Step 2: Display the matrix
>mat
Figure 2. Matrix with users-items
Step 3: coerce into a realRatingMAtrix
>r <- as(mat, "realRatingMatrix")
>r
10 x 10 rating matrix of class ‘realRatingMatrix’ with 34
ratings.
Step 4: get information about users and items from
realRatingMAtrix
>dimnames(r)
$user
[1] "u1" "u2" "u3" "u4" "u5" "u6" "u7" "u8" "u9"
"u10"
$item
[1] "i1" "i2" "i3" "i4" "i5" "i6" "i7" "i8" "i9"
"i10"
>rowCounts(r)
u1 u2 u3 u4 u5 u6 u7 u8 u9 u10
1 4 0 4 3 2 7 2 5 6
>colCounts(r)
i1 i2 i3 i4 i5 i6 i7 i8 i9 i10
3 5 4 2 3 3 4 5 3 2
>rowMeans(r)
u1 u2 u3 u4 u5 u6
u7 u8
2.000000 4.000000 NaN 2.750000 1.333333 3.000000
1.571429 2.000000
u9 u10
1.400000 2.333333
Step 5: Find the histogram of ratings
>hist(getRatings(r), breaks="FD")

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Figure 3. getRating Graph
Taking frequency in y-axis and get ratings in x-axis generated
the histogram which is shown in fig-3.
Step 6: inspect a subset
>image(r[1:5,1:5])
Figure 4. Inspecting users with items
Since the top-N lists are ordered, we can extract sub lists of the
best items in the top-N shown in fig-3.
Step 7: coerce it back to see if it worked which resulted as
shown in fig-4
Figure 5. coerce the users-items back
Step 8: coerce to data.frame (user/item/rating triplets)
user item rating
4 u1 i2 2
9 u2 i3 5
25 u2 i8 4
30 u2 i9 5
33 u2 i10 2
5 u4 i2 4
10 u4 i3 2
15 u4 i5 5
31 u4 i9 0
11 u5 i3 0
21 u5 i7 4
26 u5 i8 0
13 u6 i4 2
22 u6 i7 4
6 u7 i2 2
12 u7 i3 2
14 u7 i4 3
18 u7 i6 0
23 u7 i7 0
32 u7 i9 3
34 u7 i10 1
1 u8 i1 1
27 u8 i8 3
2 u9 i1 3
7 u9 i2 1
16 u9 i5 0
19 u9 i6 3
28 u9 i8 0
3 u10 i1 4
8 u10 i2 4
17 u10 i5 1
20 u10 i6 0
24 u10 i7 1
29 u10 i8 4
Step 9: binarize into a binaryRatingMatrix with all 4+
rating a 1
>b <- binarize(r, minRating=4)
>b
10 x 10 rating matrix of class ‘binaryRatingMatrix’ with
10 ratings.
>as(b, "matrix")

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Figure 6. Recommendations as ‘topNList’
B. .Create a recommender model
To implement the actual recommender algorithm we need to
implement a creator function which takes a training data set,
trains a model and provides a predict function which uses the
model to create recommendations for new data. The model
and the predict function are both encapsulated in an object of
class Recommender. Let us Discuss the recommendation
model with MSWeb dataset.
Step 1: use MSWeb dataset
>data(MSWeb)
Step 2: create a sample of 10
>MSWeb10 <- sample(MSWeb[rowCounts(MSWeb) >10,],
100)
Step 3:create a recommender with popular method for
binaryRatingMatrix
> rec <- Recommender(MSWeb10, method = "POPULAR")
Step 4: Display the method output
> rec
Recommender of type „POPULAR‟ for
„binaryRatingMatrix‟ learned using 100 users.
Step 5: get the model
The model can be obtained from a recommender
using getModel().
>getModel(rec)
$topN
Recommendations as ‘topNList’ with n = 285 for 1
users.
In this case the model has a top-N list to store the
popularity order and further elements .
Many recommender algorithms can also predict ratings. This
is also implemented using predict() with the parameter type set
to "ratings". We can implement several standard evaluation
methods for recommender systems. Evaluation starts with
creating an evaluation scheme that determines what and how
data is used for training and testing. Create an evaluation
scheme which splits the first 1000 users in the dataset into a
training set (90%) and a test set (10%). For the test set 15
items will be given to the recommender algorithm and the
other items will be held out for computing the error.
Usual metrics for evaluating a recommendation engine is Root
Mean Squared Error(RMSE). A/B site testing is used, which
focuses on the user interaction with the website and
understanding the crucial components in the website with a
parameter such as Click Through Rate (CTR).
VI. CONCLUSION
Recommender systems for product reviews open up new
opportunities of retrieving personalized information on the
social networking sites. It also helps to alleviate the problem
of information overload which is a very common phenomenon
with information retrieval systems and enables users to have
access to products and services which are not readily available
to users on the system. Studied underlying technology of
recommendation system, implemented the recommender
algorithms and performances were discussed. This knowledge
will empower infant researchers and serve as a road map to
develop new recommendation techniques.
REFERENCES
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[8] Liu, Jingjing, et al. "Low-Quality Product Review Detection in Opinion
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[9] Asuncion, A., Newman, D.J. (2007). UCI Machine Learning Repository,
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[10] Michael Hahsler (2017). recommenderlab: Lab for Developing and
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[11] Joachims, Thorsten. A Probabilistic Analysis of the Rocchio Algorithm
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