Category Archives: Big Data

Contextual Outlier Detection with Statistical Modeling on Spark

Sometimes an outlier is defined with respect to a context. Whether a data point should be labeled as an outlier depends on the associated context. For a bank ATM, transactions that are considered normal between 6 AM and 10 PM, … Continue reading

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Pluggable Rule Driven Data Validation with Spark

Data validation is an essential component in any ETL data pipeline. As we all know most Data Engineers and Scientist spend most of their time cleaning and preparing their data before they can even get to the core processing of … Continue reading

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Leave One Out Encoding for Categorical Feature Variables on Spark

Categorical feature variables is a thorny issue for many supervised Machine Learning algorithms. Many learning algorithms can not handle categorical feature variables. In this post, we will go over an encoding scheme called Leave One Out Encoding, as implemented with … Continue reading

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Handling Categorical Feature Variables in Machine Learning using Spark

Categorical features variables i.e. features variables with fixed set of unique values  appear in the training data set for many real world problems. However, categorical variables pose a serious problem for many Machine Learning algorithms. Some examples of such algorithms … Continue reading

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Optimizing Discount Price for Perishable Products with Thompson Sampling using Spark

For retailers, stocking perishable products is a risky business. If a product doesn’t sell completely by the expiry date, then the remaining inventory has to be discarded and loss be taken for those items. Retailers will do whatever is necessary … Continue reading

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Data Type Auto Discovery with Spark

In the life of a Data Scientist, it’s not uncommon to run into a data set with no knowledge or very little knowledge about the data. You may be interested in learning about such data with missing meta data  through … Continue reading

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Data Normalization with Spark

Data normalization is a required data preparation step for many Machine Learning algorithms. These algorithms are sensitive to the relative values of the feature attributes. Data normalization is the process of bringing all the attribute values within some desired range. Unless … Continue reading

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