similarity


R Clustering – A Tutorial for Cluster Analysis with R

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We calculate Between-Cluster Sum of Squares by finding the square of difference from the center of gravity for each cluster and then adding them. We calculate Within-Cluster Sum of Squares by finding the square of difference from the center of gravity for each cluster and then adding them within in a single cluster. In R, you can easily generate different numbers of clusters for the same data by assigning different values to the centers attribute in the kmeans() command. Here you will use summary statistics for each state, such as average and standard deviation of employment rates and then use these 2 calculated features of monthly unemployment rates as attributes of clustering.


The Strange Similarity of Neuron and Galaxy Networks - Issue 50: Emergence

Nautilus

The total number of neurons in the human brain falls in the same ballpark of the number of galaxies in the observable universe. Interestingly enough, the total number of neurons in the human brain falls in the same ballpark of the number of galaxies in the observable universe. Researchers regularly use a technique called power spectrum analysis to study the large-scale distribution of galaxies. Based on the latest analysis of the connectivity of the brain network, independent studies have concluded that the total memory capacity of the adult human brain should be around 2.5 petabytes, not far from the 1-10 petabyte range estimated for the cosmic web!


Implementing MaLSTM on Kaggle's Quora Question Pairs competition

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Few months ago I came across a very nice article called Siamese Recurrent Architectures for Learning Sentence Similarity which offers a pretty straightforward approach at the common problem of sentence similarity. Siamese network seem to perform good on similarity tasks and have been used for tasks like sentence semantic similarity, recognizing forged signatures and many more. Word embedding is a modern way to represent words in deep learning models, more about it can be found in this nice blog post. Inputs to the network are zero padded sequences of word indices, these inputs are vectors of fixed length, where the first zeros are being ignored and the non zeros are indices that uniquely identify words.


Beginners Guide to learn about Content Based Recommender Engine

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The concepts of Term Frequency (TF) and Inverse Document Frequency (IDF) are used in information retrieval systems and also content based filtering mechanisms (such as a content based recommender). Next, the user profile vectors are also created based on his actions on previous attributes of items and the similarity between an item and a user is also determined in a similar way. The method of calculating the user's likes / dislikes / measures is calculated by taking the cosine of the angle between the user profile vector(Ui) and the document vector. For example: for normal movie recommender system, a simple binary representation is more useful whereas for a search query in search engine like google, a count representation might be more appropriate.


Document Similarity Analysis Using ElasticSearch and Python

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To install, just unzip the downloaded file and run bin/elasticsearch.bat To install on unix systems you have to run bin/elasticsearch. Elasticsearch also uses index to decide how to distribute data around the cluster. To get the most similar documents we use mlt, which stands for "more like this". It takes a set of urls from a file called "urls_file.txt" crawls them indexes them and for each document indexed fetches the nearest documents and outputs the cosine similarity score into a file "output.csv" in the current directory.


30 Questions to test a data scientist on Natural Language Processing [Solution: Skilltest – NLP] - Analytics Vidhya

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"Analytics Vidhya is a great source to learn data science" "#Analytics-vidhya is a great source to learn @data_science." After performing stopword removal and punctuation replacement the text becomes: "Analytics vidhya great source learn data science" "The next meetup on data science will be held on 2017-09-21, previously it happened on 31/03, 2016" None if these expressions would be able to identify the dates in this text object. Choices A and B are correct because stopword removal will decrease the number of features in the matrix, normalization of words will also reduce redundant features, and, converting all words to lowercase will also decrease the dimensionality. Selection of the number of topics is directly proportional to the size of the data, while number of topic terms is not directly proportional to the size of the data.


CMU 'mind reading' program breakthrough

Daily Mail

Researchers at Carnegie Mellon University have developed brain imaging technology that can identify complex thoughts, such as'The witness shouted during the trial.' Predicted (top) and observed (bottom) fMRI brain activation patterns for the sentence'The witness shouted during the trial.' The study, led by Carnegie Mellon University Professor of Psychology Dr Marcel Just, revealed that to process sentences such as'The witness shouted during the trial,' the brain uses an alphabet of 42 'meaning components' or'semantic features' consisting of features such as person, setting size, social interaction and physical action. The study, led by Carnegie Mellon University Professor of Psychology Dr Marcel Just, revealed that to process sentences such as'The witness shouted during the trial,' the brain uses an alphabet of 42 'meaning components' or'semantic features' consisting of features such as person, setting size, social interaction and physical action.


Using AI, Predictive Analytics, and Recommendations - DZone Big Data

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Here's what retailers can get from using recommendation systems: Increased customer loyalty by sending offers based on specific customer needs. The idea is simple: we define a market basket for every customer and calculate the distance between the specific customer and others having similar items in the market basket. Then, we recommend customers buy the goods purchased earlier by those customers with similar market baskets. If a customer feature set coincides with an item feature set, then this customer gets a recommendation for this specific item.


How Faulty Data Breaks Your Machine Learning Process - Dataconomy

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Miroslav Batchkarov and other experts will be giving talks on Natural Language Processing, Machine Learning, AI Ethics and many related data fields. You can also find a more detailed blog post on Miroslav Batchkarov's personal blog at https://mbatchkarov.github.io It is often said that rather than spending a month figuring out how to apply unsupervised learning to a problem domain, a data scientist should spend a week labeling data. Gathering a sufficiently large collection of good-quality labeled data requires careful problem definition, quality control and multiple iterations. A typical data set consists of word pairs and a similarity score, e.g.


Sentiment Analysis of Movie Reviews (2): word2vec

@machinelearnbot

If we want to find similarities between words, we have to look at a corpus of texts, build a co-occurrence matrix and perform dimensionality reduction (using, e.g., singular value decomposition). Using so-called distributed representations, a word can be represented as a vector of (say 100, 200, … whatever works best) real numbers. And as we will see, with this representation, it is possible to model semantic relationships between words! This makes a lot of sense: So amazing is most similar, then we have words like excellent and outstanding.