<p><sup><sub>In the interest of taking a decision, I will post a few answers for you to vote on. Please feel free to post more. </sub></sup></p>
<p><strong>Option 2: Vote to close threads as duplicate</strong> of <a href="https://stats.stackexchange.com/questions/283170/when-is-unbalanced-data-really-a-problem-in-machine-learning">When is unbalanced data really a problem in Machine Learning?</a>.</p>
<p>*Not just new threads, but also the other threads in the question.</p>
