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はじめに

移植やってます。
( from python 3.7 to ruby 2.7 )

numpy (Python)

len(np.array(x).shape)

配列の次元を取得します。

どうすRuby

np.array(x).shape.size

NoMethodError: undefined method `size' for (3, 2):PyCall::Tuple

lenだからsizeと単純に変換するとエラーになります。
PyCallでは、Rubyで直接取り扱えないオブジェクト?を@__pyptr__として保持します。

np.array(x).shape.to_a.size

np.array(x).mean(axis: 0).to_a # mean:平均 の例

したがって必要に応じた変換を行います。

メモ

  • Python の numpy を学習した
  • 百里を行く者は九十里を半ばとす
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