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Research suggests that data scientists spend 80% of their time preprocessing data and only 20% on building machine learning models. Crowdsourcing helps break down large and complex machine learning problems into smaller and simpler tasks for a large distributed workforce. This article outlines the many benefits of crowdsourced data labeling, tips for selecting a crowdsourcing partner, and best data labeling companies on the market. To help you find the perfect partner, below we will introduce the best data-labeling companies like Lionbridge AI and Amazon Mechanical Turk.