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Hopsworks Feature Store#

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HSFS is the library to interact with the Hopsworks Feature Store. The library makes creating new features, feature groups and training datasets easy.

The library is environment indpendent and can be used in two modes:

  • Spark mode: For data engineering jobs that create and write features into the feature store or generate training datasets. It requires a Spark environment such as the one provided in the Hopsworks platform or Databricks. In Spark mode, HSFS provides bindings both for Python and JVM languages.

  • Python mode: For data science jobs to explore the features available in the feature store, generate training datasets and feed them in a training pipeline. Python mode requires just a Python interpreter and can be used both in Hopsworks from Python Jobs/Jupyter Kernels, Amazon SageMaker or KubeFlow.

The library automatically configures itself based on the environment it is run. However, to connect from an external environment such as Databricks or AWS Sagemaker, additional connection information, such as host and port, is required. For more information about the setup from external environments, see the setup section.

Getting Started On Hopsworks#

Instantiate a connection and get the project feature store handler

import hsfs

connection = hsfs.connection()
fs = connection.get_feature_store()

Create a new feature group

fg = fs.create_feature_group("rain",
                        version=1,
                        description="Rain features",
                        primary_key=['date', 'location_id'],
                        online_enabled=True)

fg.save(dataframe)

Upsert new data in to the feature group with time_travel_format="HUDI"".

fg.insert(upsert_df)

Retrieve commit timeline metdata of the feature group with time_travel_format="HUDI"".

fg.commit_details()

"Reading feature group as of specific point in time".

fg = fs.get_feature_group("rain", 1)
fg.read("2020-10-20 07:34:11").show()

Read updates that occurred between specified points in time.

fg = fs.get_feature_group("rain", 1)
fg.read_changes("2020-10-20 07:31:38", "2020-10-20 07:34:11").show()

Join features together

feature_join = rain_fg.select_all()
                    .join(temperature_fg.select_all(), on=["date", "location_id"])
                    .join(location_fg.select_all())
feature_join.show(5)

join feature groups that correspond to specific point in time

feature_join = rain_fg.select_all()
                    .join(temperature_fg.select_all(), on=["date", "location_id"])
                    .join(location_fg.select_all())
                    .as_of("2020-10-31")
feature_join.show(5)

join feature groups that correspond to different time

rain_fg_q = rain_fg.select_all().as_of("2020-10-20 07:41:43")
temperature_fg_q = temperature_fg.select_all().as_of("2020-10-20 07:32:33")
location_fg_q = location_fg.select_all().as_of("2020-10-20 07:33:08")
joined_features_q = rain_fg_q.join(temperature_fg_q).join(location_fg_q)

Use the query object to create a training dataset:

td = fs.create_training_dataset("rain_dataset",
                                version=1,
                                data_format="tfrecords",
                                description="A test training dataset saved in TfRecords format",
                                splits={'train': 0.7, 'test': 0.2, 'validate': 0.1})

td.save(feature_join)

Feed the training dataset to a TensorFlow model:

tf_data_object = training_dataset.tf_data(target_name="label",
                                          split="train",
                                          is_training=True)
train_input = tf_data_object.tf_record_dataset(batch_size=32,
                                               num_epochs=5,
                                               process=True)

You can find more examples on how to use the library in our hops-examples repository.

Documentation#

Documentation is available at Hopsworks Feature Store Documentation.

Issues#

For general questions about the usage of Hopsworks and the Feature Store please open a topic on Hopsworks Community.

Please report any issue using Github issue tracking.

Contributing#

If you would like to contribute to this library, please see the Contribution Guidelines.