why does increasing the regularization parameter (lambda) may increase or decrease the training error but it always increases the test error?

while I was calculating the test and train error with different lambda values in the regularization equation. the training error kept decreasing with increasing lambda until a certain value it increased again. while in the test error the error kept increasing by increasing lambda. I want to have a conceptional meaning for those results.

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Answer Explanation i The regularization parameter reduces overfitting which reduces the varian... View the full answer