diff --git a/src/delphi/dataset/dataset.py b/src/delphi/dataset/dataset.py
new file mode 100644
index 00000000..6b4bad26
--- /dev/null
+++ b/src/delphi/dataset/dataset.py
@@ -0,0 +1,21 @@
+from datasets import load_dataset
+from tqdm.auto import tqdm
+
+def load_clean_dataset(split: str, tokenized: bool = False) -> list[str]:
+    # checking just startswith, because you can include slice like "train[:1000]"
+    assert split.startswith("train") or split.startswith("validation")
+    hf_ds = load_dataset(f"jbrinkma/tinystories-v2-clean{'-tokenized' if tokenized else ''}", split=split)
+    dataset = []
+    # hf_ds technically isn't guaranteed to be subscriptable, but it is in this case
+    for sample in tqdm(hf_ds["tokens" if tokenized else "text"]):  # type: ignore
+        dataset.append(sample)
+    return dataset
+
+def token_map(tokenized_dataset: list[list[int]]) -> dict[int, list[tuple[int, int]]]:
+    mapping = {}
+
+    for prompt_idx, prompt in enumerate(tokenized_dataset):
+        for token_idx, token in enumerate(prompt):
+            mapping.setdefault(token, []).append((prompt_idx, token_idx))
+
+    return mapping
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