the output of a PCA process is a system of linear combinations of the data. so yes, you&#x27;d take the principal components of your future inputs, but the process would be super fast (it&#x27;s a linear transformation with known parameters) since you don&#x27;t need to rerun anything.<p>you can also do online PCA (updating the model as you get new data) but i&#x27;m not sure about runtime&#x2F;computation requirements.