# [ML Interview] - What’s the trade-off between bias and variance?


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## What’s the trade-off between bias and variance?

* Bias and variance are complements of each other.
* Model with the higher bias tends to under fit the point of the dataset but has smoother inference curve.
* Model with the higher variance tends to over fit the point of the training data but takes into more consideration the noise and fluctuation.
* When considering the bias and variance trade-off, we want to find the optimal point which has both low bias and low variance by tuning the model complexity.