Data Cleaning


Data Wrangling Is AI's Big Business Opportunity

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Artificial intelligence (AI) is quickly becoming a day-to-day component of software development across the globe. If you've been following the trends at all, you're probably very familiar with the term "algorithm." That's because, to the world's big tech companies like Google, Amazon and Facebook, AI is all about developing and leveraging new AI algorithms to gain deeper insights from the information being collected on and about all of us. However you feel about privacy, the tech giants' emphasis on algorithms has been good for AI and machine learning (ML) businesses in general. Not only are these companies pushing the boundaries of ML, but they're also putting their algorithms out there as open-source products for the world to use.


The real big-data problem and why only machine learning can fix it - SiliconANGLE

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Why do so many companies still struggle to build a smooth-running pipeline from data to insights? They invest in heavily hyped machine-learning algorithms to analyze data and make business predictions. Then, inevitably, they realize that algorithms aren't magic; if they're fed junk data, their insights won't be stellar. So they employ data scientists that spend 90% of their time washing and folding in a data-cleaning laundromat, leaving just 10% of their time to do the job for which they were hired. What is flawed about this process is that companies only get excited about machine learning for end-of-the-line algorithms; they should apply machine learning just as liberally in the early cleansing stages instead of relying on people to grapple with gargantuan data sets, according to Andy Palmer, co-founder and chief executive officer of Tamr Inc., which helps organizations use machine learning to unify their data silos.


7 Steps to Mastering Data Preparation for Machine Learning with Python -- 2019 Edition

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Whatever term you choose, they refer to a roughly related set of pre-modeling data activities in the machine learning, data mining, and data science communities. Data cleansing may be performed interactively with data wrangling tools, or as batch processing through scripting. This may include further munging, data visualization, data aggregation, training a statistical model, as well as many other potential uses. Data munging as a process typically follows a set of general steps which begin with extracting the data in a raw form from the data source, "munging" the raw data using algorithms (e.g. I would say that it is "identifying incomplete, incorrect, inaccurate or irrelevant parts of the data and then replacing, modifying, or deleting the dirty or coarse data" in the context of "mapping data from one'raw' form into another..." all the way up to "training a statistical model" which I like to think of data preparation as encompassing, or "everything from data sourcing right up to, but not including, model building."


Training Machine Learning Models Using Noisy Data - Butterfly Network

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Dr. Zaius: I think you're crazy. The concept of a second opinion in medicine is so common that most people take it for granted, especially given a severe diagnosis. Disagreement between two doctors may be due to different levels of expertise, different levels of access to patient information or simply human error. Like all humans, even the world's best doctors make mistakes. At Butterfly, we're building machine learning tools that will act as a second pair of eyes for a doctor and even automate part of their workflow that is laborious or error prone.


Machine learning for data cleaning and unification

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The biggest problem data scientist face today is dirty data. When it comes to real world data, inaccurate and incomplete data are the norm rather than the exception. The root of the problem is at the source where data being recorded does not follow standard schemas or breaks integrity constraints. The result is that dirty data gets delivered downstream to systems like data marts where it is very difficult to clean and unify, thus making it unreliable to utilize for analytics. Today data scientists often end up spending 60% of their time cleaning and unifying dirty data before they can apply any analytics or machine learning.


Learning to combine Grammatical Error Corrections

arXiv.org Artificial Intelligence

The field of Grammatical Error Correction (GEC) has produced various systems to deal with focused phenomena or general text editing. We propose an automatic way to combine black-box systems. Our method automatically detects the strength of a system or the combination of several systems per error type, improving precision and recall while optimizing $F$ score directly. We show consistent improvement over the best standalone system in all the configurations tested. This approach also outperforms average ensembling of different RNN models with random initializations. In addition, we analyze the use of BERT for GEC - reporting promising results on this end. We also present a spellchecker created for this task which outperforms standard spellcheckers tested on the task of spellchecking. This paper describes a system submission to Building Educational Applications 2019 Shared Task: Grammatical Error Correction. Combining the output of top BEA 2019 shared task systems using our approach, currently holds the highest reported score in the open phase of the BEA 2019 shared task, improving F0.5 by 3.7 points over the best result reported.


Data cleaning in Python: some examples from cleaning Airbnb data

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I previously worked for a year and a half at an Airbnb property management company, as head of the team responsible for pricing, revenue and analysis. One thing I find particularly interesting is how to figure out what price to charge for a listing on the site. Although'it's a two bedroom in Manchester' will get you reasonably far, there are actually a huge number of factors that can influence a listing's price. As part of a bigger project on using deep learning to predict Airbnb prices, I found myself thrown back into the murky world of property data. Geospatial data can be very complex and messy -- and user-entered geospatial data doubly so.


The complete beginner's guide to data cleaning and preprocessing

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Data preprocessing is the first (and arguably most important) step toward building a working machine learning model. If your data hasn't been cleaned and preprocessed, your model does not work. Data preprocessing is generally thought of as the boring part. But it's the difference between being prepared and being completely unprepared. You might not like the preparation part, but tightening down the details in advance can save you from one nightmare of a trip.


Using artificial intelligence for error correction in single-cell RNA sequencing

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The increased sensitivity of the technique, however, also means increased susceptibility to the batch effect. "The batch effect describes fluctuations between measurements that can occur, for example, if the temperature of the device deviates even slightly or the processing time of the cells changes," Maren Büttner explains. Although several models exist for the correction of these deviations, those methods are highly dependent on the actual magnitude of the effect. "We therefore developed a user-friendly, robust and sensitive measure called kBET that quantifies differences between experiments and therefore facilitates the comparison of different correction results," Büttner says.


News - Research in Germany

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Modern technology makes it possible to sequence individual cells and to identify which genes are currently being expressed in each cell. These methods are sensitive and consequently error prone. Devices, environment and biology itself can be responsible for failures and differences between measurements. Researchers at Helmholtz Zentrum München joined forces with colleagues from the Technical University of Munich (TUM) and the British Wellcome Sanger Institute and have developed algorithms that make it possible to predict and correct such sources of error. The work was published in'Nature Methods' and'Nature Communications'.