For me ‘deeply’ involves coding. I must have read dozens of papers carefully and then failed to implement the technique first time due to either my misunderstanding something, or finding something in the paper to be unclear, wrong or omitted! Or you realise that the technique works well but would scale horribly / can’t be extended etc. That could take several days—so that treatment is reserved for special selections.
For me ‘deeply’ involves coding. I must have read dozens of papers carefully and then failed to implement the technique first time due to either my misunderstanding something, or finding something in the paper to be unclear, wrong or omitted! Or you realise that the technique works well but would scale horribly / can’t be extended etc. That could take several days—so that treatment is reserved for special selections.