Step 1: Hello World

Installing Hub and accessing your first Hub Dataset.

Installing Hub

Hub can be installed through pip.

$ pip3 install hub

Fetching Your First Hub Dataset

Let's load MNIST, the hello world dataset of machine learning.

First, instantiate a Dataset by pointing it to the dataset's locations. Datasets hosted on Activeloop Platform are typically identified by the namespace of the organization followed by the dataset name: activeloop/mnist-train.

import hub
dataset_path = 'hub://activeloop/mnist-train'
ds = hub.load(dataset_path) # Returns a Hub Dataset but does not download data locally

Reading Samples From a Hub Dataset

Data is not immediately read into memory because Hub operates lazily. You can fetch data by calling the .numpy() method, which reads data into a NumPy array.

# Indexing
W = ds.images[0].numpy() # Fetch an image and return a NumPy array
X = ds.labels[0].numpy(aslist=True) # Fetch a label and store it as a
# list of NumPy arrays
# Slicing
Y = ds.images[0:100].numpy() # Fetch 100 images and return a NumPy array
# The method above produces an exception if
# the images are not all the same size
Z = ds.labels[0:100].numpy(aslist=True) # Fetch 100 labels and store
# them as a list of NumPy arrays

Congratulations, you've got Hub working on your local machine🤓