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fadis_'s profile
Fadis
Fadis
Fadis
@fadis_

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Fadis

@fadis_

組み込みから*NIXシステム、HPCまで、計算機をこよなく愛するゲームプログラマ。C++を関数型言語と間違えているタイプのC++er。遺伝的FM音源とかの人。 丼:@fadis@mstdn.jp 欲しい物リスト:http://amzn.to/Mzt8F0 

大阪
github.com/Fadis/
Joined July 2010

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    1. アーさん@疾風のプログラマ‏ @a3geek 4 Oct 2018
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      ハードウェアレベルで提供されているFSIN, FCOSは精度と速度の両面で微妙だから使ってないって話は覚えてる

      1 reply 0 retweets 2 likes
    2. Fadis‏ @fadis_ 4 Oct 2018
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      Replying to @a3geek

      非線形の関数が間に挟まってると事前に行列を計算できないから、可能な限り早い段階(データを用意する段階とか)で非線形の関数を排除して、それでも残るやつも可能な限り線形で近似できないか検討せよ、という話ならよくある

      1 reply 0 retweets 2 likes
    3. アーさん@疾風のプログラマ‏ @a3geek 4 Oct 2018
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      Replying to @fadis_

      高級言語側で三角関数使うと、コンパイラあたりで最適化してくれて、適当な線形の近似関数に置き換えられる? あれ、行列ってことはGPU側の話?

      2 replies 0 retweets 1 like
      Fadis‏ @fadis_ 4 Oct 2018
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      Replying to @a3geek

      だから何種類もの入力に対する結果を得たい場合、素直に関数を順番に適用するより全ての関数に通すのと等価な行列を求めた方が計算が速い。ところが間に非線形な関数が混ざっているとこの手が使えなくなる。だから非線形な関数である三角関数はこうした処理から排除したい。

      11:35 PM - 4 Oct 2018
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      • アーさん@疾風のプログラマ
      1 reply 0 retweets 2 likes
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        2. アーさん@疾風のプログラマ‏ @a3geek 4 Oct 2018
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          Replying to @fadis_

          そうか、線形写像からの話か。それで三角関数を線形で近似できると、事前に行列を計算しておけるから計算速度が出せるのか。それって、実際に各言語レベルで実装されていたりするものなんですか?いまどき、三角関数を真面目にマクローリン展開しているものなんですかね

          1 reply 0 retweets 1 like
        3. Fadis‏ @fadis_ 4 Oct 2018
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          Replying to @a3geek

          そこまでコンパイラがやってくれる事例というのは知らないなぁ。多くの場合これは勝手に変換されたら困るんだ。2つの計算方法は値が実数の場合同じ結果になるんだけど、浮動小数点数の場合誤差が変わる可能性がある。

          1 reply 0 retweets 1 like
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