xberg

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defmodule Xberg.LayoutStrategy do
  @moduledoc """
  Which PDF pages the layout model runs on.

  Layout detection renders each selected page to a raster and runs ONNX
  inference on it, which dominates extraction cost. This controls page
  selection; [`LayoutStrategy::Always`] preserves the historical behavior of
  running on every page. Wire format is snake_case in all serializers
  (JSON, TOML, YAML).
  """

  @typedoc "Which PDF pages the layout model runs on."
  @type t :: :always | :auto

  @always :always
  @auto :auto

  @doc "Run layout detection unconditionally on every page."
  @spec always() :: t()
  def always, do: @always
  @doc "Pre-screen each page with cheap geometry signals and run the model only on pages likely to benefit (multi-column, table-bearing, figure-heavy, form-like, or rotated pages)."
  @spec auto() :: t()
  def auto, do: @auto
end