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HookedDataLoader

Struct HookedDataLoader 

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pub struct HookedDataLoader<T>
where T: Element,
{ /* private fields */ }
Expand description

Sampler で選んだサンプルへ transform/collate フックをかけて バッチ化するローダー(PyTorch DataLoader(sampler=, collate_fn=) 相当。イシュー #2182)。内部に SamplerDataLoader<TensorDataset<T>> を持つ(合成)。issue の callback シグネチャ(Tensor 単体)に合わせ TensorDataset<T> 限定とする(タプルデータセットでのサンプル単位フックは対象外。 docs/tensor-core-data-sampler-hooks-decision.md §2.2・§6)。

§処理順(AC-4)

HookedBatches::next は「サンプリング → サンプルごとに transform → collate」の順で処理する。transform も collate も未設定なら Dataset::batch への fast path を通る(コピー 1 回。[Self:: with_transform]/Self::with_collate を一度でも呼ぶと slow path に切り替わる)。

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impl<T> HookedDataLoader<T>
where T: Element,

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pub fn new( dataset: TensorDataset<T>, sampler: impl Sampler + 'static, ) -> Result<HookedDataLoader<T>, DataError>

SamplerDataLoader::new と同じ契約(タプルではないため validate() は常に Ok(()))。

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pub fn with_transform( self, f: impl Fn(Tensor<T>) -> Tensor<T> + Send + Sync + 'static, ) -> HookedDataLoader<T>

builder: infallible な transform を設定する(issue の字句どおり のシグネチャ)。内部では Ok で包んで保持する。

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pub fn with_try_transform( self, f: impl Fn(Tensor<T>) -> Result<Tensor<T>, DataError> + Send + Sync + 'static, ) -> HookedDataLoader<T>

builder: fallible な transform を設定する。

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pub fn with_collate( self, f: impl Fn(&[Tensor<T>]) -> Tensor<T> + Send + Sync + 'static, ) -> HookedDataLoader<T>

builder: infallible な collate を設定する(issue の字句どおりの シグネチャ)。

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pub fn with_try_collate( self, f: impl Fn(&[Tensor<T>]) -> Result<Tensor<T>, DataError> + Send + Sync + 'static, ) -> HookedDataLoader<T>

builder: fallible な collate を設定する。

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pub fn dataset(&self) -> &TensorDataset<T>

保持するデータセットへの参照。

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pub fn into_dataset(self) -> TensorDataset<T>

内部の dataset を取り出す。

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pub fn num_batches(&self) -> Option<usize>

1 epoch あたりのバッチ数(Sampler::num_batches が Some を 返す場合のみ)。

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pub fn iter(&mut self) -> HookedBatches<'_, T> ⓘ

1 epoch 分のイテレータを返す。

Trait Implementations§

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impl<T> Debug for HookedDataLoader<T>
where T: Element,

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more

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