# Data Loading and Input Models

**English** · <a href="../../../zh/manual/algorithms/groups/input-models.html">简体中文</a>

This category covers the input prerequisites of algorithms: loading classical data, Boolean truth tables, and operators into oracles, block encodings, and quantum data structures. Most entries come from the `oracq.algorithms.input_model` subpackage (`prepare-select` comes from `common`); before using any estimation, solving, or simulation algorithm, an appropriate access model usually needs to be selected and constructed here first.

```{toctree}
:maxdepth: 1

../state-preparation
../alias-preparation
../xor-database
../adjacency-oracle
../select-swap
../qrom-lookup
../block-encoding-algebra
../sparse-access
../sparse-block-encoding
../prepare-select
../purification
../gibbs-state
../double-factorization
../thc
```