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chore: import upstream snapshot with attribution
2026-07-13 13:24:32 +08:00

107 lines
3.3 KiB
Python

import lance
import numpy as np
import pyarrow as pa
import pytest
from datasets import load_dataset
@pytest.fixture
def lance_dataset(tmp_path) -> str:
data = pa.table(
{
"id": pa.array([1, 2, 3, 4]),
"value": pa.array([10.0, 20.0, 30.0, 40.0]),
"text": pa.array(["a", "b", "c", "d"]),
"vector": pa.FixedSizeListArray.from_arrays(pa.array([0.1] * 16, pa.float32()), list_size=4),
}
)
dataset_path = tmp_path / "test_dataset.lance"
lance.write_dataset(data, dataset_path)
return str(dataset_path)
@pytest.fixture
def lance_hf_dataset(tmp_path) -> str:
data = pa.table(
{
"id": pa.array([1, 2, 3, 4]),
"value": pa.array([10.0, 20.0, 30.0, 40.0]),
"text": pa.array(["a", "b", "c", "d"]),
"vector": pa.FixedSizeListArray.from_arrays(pa.array([0.1] * 16, pa.float32()), list_size=4),
}
)
dataset_dir = tmp_path / "data" / "train.lance"
dataset_dir.parent.mkdir(parents=True, exist_ok=True)
lance.write_dataset(data, dataset_dir)
lance.write_dataset(data[:2], tmp_path / "data" / "test.lance")
with open(tmp_path / "README.md", "w") as f:
f.write("""---
size_categories:
- 1M<n<10M
source_datasets:
- lance_test
---
# Test Lance Dataset\n\n
# My Markdown is fancier\n
""")
return str(tmp_path)
def test_load_lance_dataset(lance_dataset):
dataset_dict = load_dataset(lance_dataset)
assert "train" in dataset_dict.keys()
dataset = dataset_dict["train"]
assert "id" in dataset.column_names
assert "value" in dataset.column_names
assert "text" in dataset.column_names
assert "vector" in dataset.column_names
ids = dataset["id"]
assert ids == [1, 2, 3, 4]
@pytest.mark.parametrize("streaming", [False, True])
def test_load_hf_dataset(lance_hf_dataset, streaming):
dataset_dict = load_dataset(lance_hf_dataset, columns=["id", "text"], streaming=streaming)
assert "train" in dataset_dict.keys()
assert "test" in dataset_dict.keys()
dataset = dataset_dict["train"]
assert "id" in dataset.column_names
assert "text" in dataset.column_names
assert "value" not in dataset.column_names
assert "vector" not in dataset.column_names
ids = list(dataset["id"])
assert ids == [1, 2, 3, 4]
text = list(dataset["text"])
assert text == ["a", "b", "c", "d"]
assert "value" not in dataset.column_names
def test_load_vectors(lance_hf_dataset):
dataset_dict = load_dataset(lance_hf_dataset, columns=["vector"])
assert "train" in dataset_dict.keys()
dataset = dataset_dict["train"]
assert "vector" in dataset.column_names
vectors = dataset.data["vector"].combine_chunks().values.to_numpy(zero_copy_only=False)
assert np.allclose(vectors, np.full(16, 0.1))
@pytest.mark.parametrize("streaming", [False, True])
def test_load_lance_streaming_modes(lance_hf_dataset, streaming):
"""Test loading Lance dataset in both streaming and non-streaming modes."""
from datasets import IterableDataset
ds = load_dataset(lance_hf_dataset, split="train", streaming=streaming)
if streaming:
assert isinstance(ds, IterableDataset)
items = list(ds)
else:
items = list(ds)
assert len(items) == 4
assert all("id" in item for item in items)