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Low-Level API Summary

Summary of the most important low-level Deep Lake commands.

Deep Lake Low-Level API Basics

Import and Installation

By default, Deep Lake does not install dependencies for audio, video, google-cloud, and other features. Details on installation options are available here.
!pip3 install deeplake
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import deeplake

Loading Deep Lake Datasets

Deep Lake datasets can be stored at a variety of storage locations using the appropriate dataset_path parameter below. We support S3, GCS, Activeloop storage, and are constantly adding to the list.
# Load a Deep Lake Dataset
ds = deeplake.load('dataset_path', creds = {'optional'}, token = 'optional')

Creating Deep Lake Datasets

# Create an empty Deep Lake dataset
ds = deeplake.empty('dataset_path', creds = {'optional'}, token = 'optional')
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# Create an Deep Lake Dataset with the same tensors as another dataset
ds = deeplake.like(ds_object or 'dataset_path', creds = {'optional'}, token = 'optional')
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# Automatically create a Deep Lake Dataset from another data source
ds = deeplake.ingest(source_folder, deeplake_dataset_path, ... 'see API reference for details')
ds = deeplake.ingest_coco(images_folder, 'annotations.json', deeplake_dataset_path, ... 'see API reference for details')
ds = deeplake.ingest_yolo(data_directory, deeplake_dataset_path, class_names_file, ... 'see API reference for details')

Deleting Datasets

ds.delete()
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deeplake.delete('dataset_path', creds = {'optional'}, token = 'optional', token = 'optional')
API deletions of Deep Lake Cloud datasets are immediate, whereas UI-initiated deletions are postponed by 5 minutes. Once deleted, dataset names can't be reused in the Deep Lake Cloud.

Creating Tensors

# Specifying htype is recommended for maximizing performance.
ds.create_tensor('my_tensor', htype = 'bbox')
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# Specifiying the correct compression is critical for images, videos, audio and
# other rich data types.
ds.create_tensor('songs', htype = 'audio', sample_compression = 'mp3')

Creating Tensor Hierarchies

ds.create_group('my_group')
ds.my_group.create_tensor('my_tensor')
ds.create_tensor('my_group/my_tensor') #Automatically creates the group 'my_group'

Visualizing and Inspecting Datasets

ds.visualize()
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ds.summary()

Appending Data to Datasets

ds.append({'tensor_1': np.ones((1,4)), 'tensor_2': deeplake.read('image.jpg')})
ds.my_group.append({'tensor_1': np.ones((1,4)), 'tensor_2': deeplake.read('image.jpg')})

Appending/Updating Data in Individual Tensors

# Append a single sample
ds.my_tensor.append(np.ones((1,4)))
ds.my_tensor.append(deeplake.read('image.jpg'))
​
# Append multiple samples. The first axis in the
# numpy array is assumed to be the sample axis for the tensor
ds.my_tensor.extend(np.ones((5,1,4)))
​
# Editing or adding data at a specific index
ds.my_tensor[i] = deeplake.read('image.jpg')

Deleting data

# Removing samples by index
ds.pop[i]
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# Delete all data in a tensor
ds.<tensor_name>.clear()
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# Delete tensor and all of its data
ds.delete_tensor(<tensor_name>)

Appending Empty Samples or Skipping Samples

# Data appended as None will be returned as an empty array
ds.append('tensor_1': deeplake.read(...), 'tensor_2': None)
ds.my_tensor.append(None)
​
# Empty arrays can be explicitly appended if the length of the shape
# of the empty array matches that of the other samples
ds.boxes.append(np.zeros((0,4))

Accessing Tensor Data

# Read the i-th tensor sample
np_array = ds.my_tensor[i].numpy()
text = ds.my_text_tensor[i].data() # More comprehensive view of the data
bytes = ds.my_tensor[i].tobytes() # More comprehensive view of the data
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# Read the i-th dataset sample as a numpy array
image = ds[i].images.numpy()
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# Read the i-th labels as a numpy array or list of strings
labels_array = ds.labels[i].numpy()
labels_array = ds.labels[i].data()['value'] # same as .numpy()
labels_string_list = ds.labels[i].data()['text']
​
​
# Read a tensor sample from a hierarchical group
np_array = ds.my_group.my_tensor_1[i].numpy()
np_array = ds.my_group.my_tensor_2[i].numpy()
​
# Read multiple tensor samples into numpy array
np_array = ds.my_tensor[0:10].numpy()
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# Read multiple tensor samples into a list of numpy arrays
np_array_list = ds.my_tensor[0:10].numpy(aslist=True)

Maximizing performance

Make sure to use the with context when making any updates to datasets.
with ds:
​
ds.create_tensor('my_tensor')
for i in range(10):
ds.my_tensor.append(i)

Connecting Deep Lake Datasets to ML Frameworks

# PyTorch Dataloader
dataloader = ds.pytorch(batch_size = 16, transform = {'images': torchvision_tform, 'labels': None}, num_workers = 2, scheduler = 'threaded')
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# TensorFlow Dataset
ds_tensorflow = ds.tensorflow()
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# Enterprise Dataloader
dataloader = ds.dataloader().batch(batch_size = 64).pytorch(num_workers = 8)

Versioning Datasets

# Commit data
commit_id = ds.commit('Added 100 images of trucks')
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# Print the commit log
log = ds.log()
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# Checkout a branch or commit
ds.checkout('branch_name' or commit_id)
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# Create a new branch
ds.checkout('new_branch', create = True)
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# Examine differences between commits
ds.diff()
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# Delete all changes since the previous commit
ds.reset()
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# Delete a branch and its commits - Only allowed for branches that have not been merged
ds.delete_branch('branch_name')

Querying Datasets and Saving Dataset Views

A full list of supported queries is shown here.
view = ds.query("Select * where contains(labels, 'giraffe')")
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view.save_view(optimize = True)
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view = ds.load_view(id = 'query_id')
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# Return the original dataset indices that satisfied the query condition
indices = list(view.sample_indices)

Adding Tensor and Dataset-Level Metadata

# Add or update dataset metadata
ds.info.update(key1 = 'text', key2 = number)
# Also can run ds.info.update({'key1'='value1', 'key2' = num_value})
​
# Add or update tensor metadata
ds.my_tensor.info.update(key1 = 'text', key2 = number)
​
# Delete metadata
ds.info.delete() #Delete all metadata
ds.info.delete('key1') #Delete 1 key in metadata

Copying datasets

# Fastest option - copies everything including version history
ds = deeplake.deepcopy('src_dataset_path', 'dest_dataset_path', src_creds, dest_creds, token)
​
# Slower option - copies only data on the last commit
ds = deeplake.copy('src_dataset_path', 'dest_dataset_path', src_creds, dest_creds, token)

Advanced

# Load a Deep Lake Dataset if it already exists (same as deeplake.load), or initialize
# a new Deep Lake Dataset if it does not already exist (same as deeplake.empty)
ds = deeplake.dataset('dataset_path', creds = {'optional'}, token = 'optional')
​
​
# Append multiple samples using a list
ds.my_tensor.extend([np.ones((1,4)), np.ones((3,4)), np.ones((2,4)
​
​
# Fetch adjacent data in the chunk -> Increases speed when loading
# sequantially or if a tensor's data fits in the cache.
numeric_label = ds.labels[i].numpy(fetch_chunks = True)