Python API 0.8.0

0.8.0 - 2024-09-23

Breaking

• Disallow positional parameters for the learners, except for label and task.
• Remove the unsupported / invalid hyperparameters from the Isolation Forest
  learner.
• Remove parameters for distributed training and resuming training from
  learners that do not support these capabilities.
• By default, model.analyze for a maximum of 20 seconds (i.e.
  maximum_duration=20 by default).
• Convert boolean values in categorical sets to lowercase, matching the
  treatment of categorical features.

Feature

• Warn if training on a VerticalDataset and fail if attempting to modify the
  columns in a VerticalDataset during training.
• User can override the model's task, label or group during evaluation.
• Add num_examples_per_tree() method to Isolation Forest models.
• Expose the slow engine for debugging predictions and evaluations with
  use_slow_engine=True.
• Speed-up training of GBT models by ~10%.
• Support for categorical and boolean features in Isolation Forests.
• Add ydf.util.read_tf_record and ydf.util.write_tf_record to facilitate
  TF Record datasets usage.
• Rename LAMBDA_MART_NDCG5 to LAMBDA_MART_NDCG. The old name is deprecated but
  can still be used.
• Allow configuring the truncation of NDCG losses.
• Enable multi-threading when using model.predict and model.evaluate.
• Default number of threads of model.analyze is equal to the number of
  cores.
• Add multi-threaded results in model.benchmark.
• Add argument to control the maximum duration of model.analyze.
• Add support for Unicode strings, normalize categorical set values in the
  same way as categorical values, and validate their types.
• Add support for distributed training for ranking gradient boosted tree
  models.

Fix

• Fix labels of regression evaluation plots
• Improved errors if Isolation Forest training fails.

Release music

Perpetuum Mobile "Ein musikalischer Scherz", Op. 257. Johann Strauss (Sohn)

v1.10.0

1.10.0 - 2024-08-21

Features

• Add support for Isolation Forests model.
• The default value of num_candidate_attributes in the CART learner is
  changed from 0 (Random Forest style sampling) to -1 (no sampling). This is
  the generally accepted logic of CART.
• Added support for GCS for file I/O.

Python API 0.7.0

Python API 0.7.0 - 2024-08-21

Feature

• Expose validate_hyperparameters() on the learner.
• Clarify which parameters in the learner are optional.
• Add support in JAX FeatureEncoder for non-string categorical feature values.
• Improve performance of Isolation Forests.
• Models can be serialized/deserialized to/from bytes with model.serialize()
  and ydf.deserialize_model.
• Models can be pickled safely.
• Native support for Xarray as a dataset format for all operations (e.g.,
  training, evaluation, predictions).
• The output of model.to_jax_function can be converted to a TensorFlow Lite
  model.
• Change the default number of examples to scan when training on files to
  determine the semantic and dictionaries of columns from 10k to 100k.
• Various improvements of error messages.
• Evaluation for Anomaly Detection models.
• Oblique splits for Anomaly Detection models.

Fix

• Fix parsing of multidimensional ragged inputs.
• Fix isolation forest hyperparameter defaults.
• Fix bug causing distributed training to fail on a sharded dataset containing
  an empty shard.
• Handle unordered categorical sets in training.
• Fix dataspec ignoring definitions of unrolled columns, such as
  multidimensional categorical integers.
• Fix error when defining categorical sets for non-ragged multidimensional
  inputs.
• MacOS: Fix compatibility with other protobuf-using libraries such as
  Tensorflow.

Release music

Rondo Alla ingharese quasi un capriccio "Die Wut über den verlorenen Groschen",
Op. 129. Ludwig van Beethoven

Python API 0.6.0

Feature

• model.to_jax_function now always outputs a FeatureEncoder to help feeding
  data to the JAX model.
• The default value of num_candidate_attributes in the CART learner is
  changed from 0 (Random Forest style sampling) to -1 (no sampling). This is
  the generally accepted logic of CART.
• model.to_tensorflow_saved_model support preprocessing functions which have
  a different signature than the YDF model.
• Improve error messages when feeding wrong size Numpy arrays.
• Add option for weighted evaluation in model.evaluate.

Fix

• Fix display of confusion matrix with floating point weights.

Known issues

• MacOS build is broken.

Python API 0.5.0

Feature

• Add support for Isolation Forests model.
• Add max_depth argument to model.print_tree.
• Add verbose argument to train method which is equivalent but sometime
  more convenient thanydf.verbose.
• Add SKLearn to YDF model converter: ydf.from_sklearn.
• Improve error messages when calling the model with non supported data.
• Add support for numpy 2.0.

Tutorials

• Add anomaly detection tutorial.
• Add YDF and JAX model composition tutorial.

Fix

• Fix error when plotting oblique trees (model.plot_tree) in colab.

Python API 0.4.3

Python API - Changelog

Feature

• Add model.to_jax_function() function to convert a YDF model into a JAX
  function that can be combined with other JAX operations.
• Print warnings when categorical features look like numbers.
• Add support for Python 3.12.

Fix

• Fix cross-validation for non-classification learners.
• Fix missing ydf/model/tree/plotter.js
• Solve dependency collision of YDF Proto between PYDF and TF-DF.

Python API 0.4.1

Python API - Changelog

Fix

• Solve dependency collision to YDF between PYDF and TF-DF. If TF-DF is
  installed after PYDF, importing YDF will fails with a has no attribute 'DType' error.
• Allow for training on cached TensorFlow dataset.

Python API 0.4.0

Python API - 0.4.0 - 2024-04-10

Feature

• Multi-dimensional features can be selected / configured with the features=
  training argument.
• Programmatic access to partial dependence plots and variable importances.
• Add model.to_tensorflow_function() function to convert a YDF model into a
  TensorFlow function that can be combined with other TensorFlow operations.
  This function is compatible with Keras 2 and Keras 3.
• Add arguments servo_api=False and feed_example_proto=False for
  model.to_tensorflow_function(mode="tf") to export TensorFlow SavedModel
  following respectively the Servo API and consuming serialized TensorFlow
  Example protos.
• Add pre_processing and post_processing arguments to the
  model.to_tensorflow_function function to pack pre/post processing
  operations in a TensorFlow SavedModel.

Tutorials

• Add tutorial
  Vertex AI with TF Serving
• Add tutorial
  Deep-learning with YDF and TensorFlow

Python API 0.3.0

Python API 0.3.0 - 2024-03-15

Breaking

• Custom losses now require to provide the gradient, instead of the negative
  of the gradient.
• Clarified that YDF may modify numpy arrays returned by a custom loss
  function.

Features

• Allow using Jax for custom loss definitions.
• Allow setting may_trigger_gc on custom losses.
• Add support for MHLD oblique decision trees.
• Expose hyperparameter sparse_oblique_max_num_projections.
• HTML plots for trees with model.plot_tree().
• Fix protobuf version to 4.24.3 to fix some incompatibilities when using
  conda.
• Allow to list compatible engines with model.list_compatible_engines().
• Allow to choose a fast engine with model.force_engine(...).

Fix

• Fix slow engine creation for some combination of oblique splits.
• Improve error message when feeding multi-dimensional labels.

Documentation

• Clarified documentation of hyperparameters for oblique splits.
• Fix plots, typos.

Release music

Doctor Gradus ad Parnassum from "Children's Corner" (L. 113). Claude Debussy

v1.9.0

1.9.0 - 2024-03-12

Feature

• Add "parallel_trials" parameter in the hyper-parameter tuner to control the number of trials to run in parallel.
• Add support for custom losses.