April 2016
Intermediate to advanced
336 pages
7h 21m
Portuguese (Portugal, Brazil)
Content preview from Data Science do ZeroBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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CAPÍTULO 8
Gradiente Descendente
Aqueles que se gabam de seus descendentes, contam vantagem do que devem aos outros.
—Seneca
Frequentemente, ao praticar data science, tentamos encontrar o melhor modelo para uma determinada situação. E, geralmente, a “melhor” significará algo como “minimiza o erro do modelo” ou “maximiza a probabilidade do dado”. Em outras palavras, representa a solução para algum tipo de problema de otimização.
Isso significa que precisaremos resolver uma quantidade de problemas de otimização. E, em especial, precisaremos resolvê-los do zero. Nossa abordagem será uma técnica chamada gradiente descendente, que se dispõe muito bem para um tratamento do zero. Você talvez não ache muito animador, mas ela nos permitirá fazer coisas ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.