Integration with Other ML Libraries

Starwhale datasets can integrate well with popular ML libraries such as Pillow, Numpy, Huggingface Datasets, Pytorch and Tensorflow, facilitating data transformation.

Pillow

Starwhale Image type and Pillow Image objects have bidirectional conversion.

Initialize Starwhale Image with Pillow Image

from starwhale import dataset

# login cloud instance in advance: `swcli instance login` command or `starwhale.login` sdk
# raw dataset url: https://cloud.starwhale.cn/projects/397/datasets/172/versions/236/files
ds = dataset("https://cloud.starwhale.cn/project/starwhale:object-detection/dataset/coco128/v2")
img = ds.head(n=1)[0].features.image

pil = img.to_pil()
print(pil)
print(pil.size)

<PIL.JpegImagePlugin.JpegImageFile image mode=RGB size=640x480 at 0x7F77FBA98250>
(640, 480)

Converting Starwhale Image to Pillow Image

import numpy
from PIL import Image as PILImage
from starwhale import Image

# generate a random image
random_array = numpy.random.randint(low=0, high=256, size=(100, 100, 3), dtype=numpy.uint8)
pil = PILImage.fromarray(random_array, mode="RGB")

img = Image(pil)
print(img)

ArtifactType.Image, display:, mime_type:MIMEType.UNDEFINED, shape:[None, None, 3], encoding:

Numpy

Converting to numpy.ndarray

The following Starwhale data types can be converted to numpy.ndarray objects:

• Image: First convert to Pillow Image type, then to numpy.ndarray object.
• Video: Directly convert video bytes to numpy.ndarray object.
• Audio: Use the soundfile library to convert audio bytes to numpy.ndarray object.
• BoundingBox: Convert to numpy.ndarray object in xywh format.
• Binary: Directly convert bytes to numpy.ndarray object.

from starwhale import dataset

# login cloud instance in advance: `swcli instance login` command or `starwhale.login` sdk
# raw dataset url: https://cloud.starwhale.cn/projects/397/datasets/172/versions/236/files
ds = dataset("https://cloud.starwhale.cn/project/starwhale:object-detection/dataset/coco128/v2")

item = ds.head(n=1)[0]

img = item.features.image
img_array = img.to_numpy()
print(img_array)
print(img_array.shape)

bbox = item.features.annotations[0]["bbox"]
print(bbox)
print(bbox.to_numpy())

<class 'numpy.ndarray'>
(480, 640, 3)
BoundingBox[XYWH]- x:1.0799999999999699, y:187.69008, width:611.5897600000001, height:285.84000000000003
array([  1.08   , 187.69008, 611.58976, 285.84   ])

Initialize Starwhale Image with numpy.ndarray

When an image is represented as a numpy.ndarray object, it can be used to initialize a Starwhale Image object.

import numpy
from starwhale import Image

# generate a random image numpy.ndarray
random_array = numpy.random.randint(low=0, high=256, size=(100, 100, 3), dtype=numpy.uint8)
img = Image(random_array)
print(img)

ArtifactType.Image, display:, mime_type:MIMEType.UNDEFINED, shape:[None, None, 3], encoding:

Huggingface Datasets

There are numerous datasets on the Huggingface Hub that can be transformed into Starwhale datasets with a single line of code.

tip

Huggingface Datasets conversion relies on the datasets library.

from starwhale import Dataset

# You only specify starwhale dataset expected name and huggingface repo name
# example: https://huggingface.co/datasets/lambdalabs/pokemon-blip-captions
ds = Dataset.from_huggingface("pokemon", "lambdalabs/pokemon-blip-captions")
print(ds)
print(len(ds))
print(repr(ds.fetch_one()))

🌊 creating dataset local/project/self/dataset/pokemon/version/r2m3is6ormwcio4gtayop25qk4gmfr6mcei6hise...
🦋 update 833 records into dataset
Dataset: pokemon, stash version: r2m3is6ormwcio4gtayop25qk4gmfr6mcei6hise, loading version: r2m3is6ormwcio4gtayop25qk4gmfr6mcei6hise
833
index:default/train/0, features:{'image': ArtifactType.Image, display:, mime_type:MIMEType.JPEG, shape:[1280, 1280, 3], encoding: , 'text': 'a drawing of a green pokemon with red eyes', '_hf_subset': 'default', '_hf_split': 'train'}, shadow dataset: None

Pytorch

Starwhale Dataset can be converted into Pytorch's torch.utils.dataset.IterableDataset object and accept transform. The converted Pytorch dataset object can then be passed to Pytorch dataloader or Huggingface Trainer, etc.

from starwhale import dataset
import torch.utils.data as tdata

def custom_transform(data):
    data["label"] = data["label"] + 100
    return data

with dataset("simple", create="empty") as ds:
    for i in range(0, 10):
        ds[i] = {"text": f"{i}-text", "label": i}
    ds.commit()

    torch_ds = ds.to_pytorch(transform=custom_transform)
    torch_loader = tdata.DataLoader(torch_ds, batch_size=1)
    item = next(iter(torch_loader))
    print(item)
    print(item["label"])

{'text': ['0-text'], 'label': tensor([100])}
tensor([100])

Tensorflow

Starwhale Dataset can be converted into Tensorflow's tensorflow.data.Dataset object and supports transform functions to mutate the data.

from starwhale import dataset

# login cloud instance in advance: `swcli instance login` command or `starwhale.login` sdk
# raw dataset url: https://cloud.starwhale.cn/projects/397/datasets/172/versions/236/files
ds = dataset("https://cloud.starwhale.cn/project/starwhale:helloworld/dataset/mnist64")
tf_ds = ds.to_tensorflow()
print(tf_ds)

<_FlatMapDataset element_spec={'label': TensorSpec(shape=(), dtype=tf.int64, name=None), 'img': TensorSpec(shape=(8, 8, 1), dtype=tf.uint8, name=None)}>