If you imagine the life of a machine learning researcher, you might think it’s quite glamorous. You’ll program self-driving cars, work for the biggest names in tech, and your could even to the downfall of humanity. So cool! But, as a new survey of data scientists and machine learners shows, those expectations need adjusting, because the biggest challenge in these professions is something quite mundane: cleaning dirty data.

This comes from a survey conducted by data science community Kaggle (which was acquired by Google earlier this ). Some 6,00 of the site’s 1.3 million members responded to the questionnaire, and when asked about the biggest barriers faced at work, the most common answer was “dirty data,” followed by a lack of talent in the field.

But what exactly is dirty data, and why is it such a problem?

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