how the training/fitting happens when both x_train and y_train are of different sizes?

[teddcp2]

hi all,

I have a doubt. It's like I have divided the data by calling train_test_split of SKLEARN. Then I am removing the outliers using percentile method for training set only.

So now my x_train is reduced compared to what it had.

But here I have question i.e. even if my y_train still has the same old size and x_train has a different size, My model is getting trained. Won't it be wrong to let the model fitting the data ?

If not, how the model is accompanied in the change?