What can you do if your model has a high variance?
How to Fix High Variance? You can reduce High variance, by reducing the number of features in the model. There are several methods available to check which features don’t add much value to the model and which are of importance. Increasing the size of the training set can also help the model generalise.
What is high bias and high variance in machine learning?
A model that exhibits small variance and high bias will underfit the target, while a model with high variance and little bias will overfit the target. A model with high variance may represent the data set accurately but could lead to overfitting to noisy or otherwise unrepresentative training data.
Why is variance a problem in machine learning?
The model will still consider the variance as something to learn from. That is, the model learns too much from the training data, so much so, that when confronted with new (testing) data, it is unable to predict accurately based on it.
What is the bias of a machine learning model?
Here, the Bias of the model is: As I explained above, when the model makes the generalizations i.e. when there is a high bias error, it results in a very simplistic model that does not consider the variations very well. Since it does not learn the training data very well, it is called Underfitting.
What happens when our model has a high variance?
Contrary to bias, the Variance is when the model takes into account the fluctuations in the data i.e. the noise as well. So, what happens when our model has a high variance?
What is the variance of a training model?
Variance is the variability of model prediction for a given data point or a value which tells us spread of our data. Model with high variance pays a lot of attention to training data and does not generalize on the data which it hasn’t seen before. As a result, such models perform very well on training data but has high error rates on test data.