Package: ludwig-myelin
Ludwig is a toolbox built on top of TensorFlow that allows to train and test deep learning models without the need to write code.All you need to provide is a CSV file containing your data, a list of columns to use as inputs, and a list of columns to use as outputs, Ludwig will do the rest.
Simple commands can be used to train models both locally and in a distributed way, and to use them to predict on new data.A programmatic API is also available in order to use Ludwig from your python code.
A suite of visualization tools allows you to analyze models' training and test performance and to compare them.Ludwig is built with extensibility principles in mind and is based on data type abstractions, making it easy to add support for new data types as well as new model architectures.It can be used by practitioners to quickly train and test deep learning models as well as by researchers to obtain strong baselines to compare against and have an experimentation setting that ensures comparability by performing standard data preprocessing and visualization.Ludwig provides a set of model architectures that can be combined together to create an end-to-end model for a given use case. As an analogy, if deep learning libraries provide the building blocks to make your building, Ludwig provides the buildings to make your city, and you can chose among the available buildings or add your own building to the set of available ones.The core design principles we baked into the toolbox are:No coding required: no coding skills are required to train a model and use it for obtaining predictions.Generality: a new data type-based approach to deep learning model design that makes the tool usable across many different use cases.Flexibility: experienced users have extensive control over model building and training, while newcomers will find it easy to use.Extensibility: easy to add new model architecture and new feature data types.Understandability: deep learning model internals are often considered black boxes, but we provide standard visualizations to understand their performance and compare their predictions.Open Source: Apache License 2.0InstallationLudwig's basic requirements are the following:tensorflownumpypandasscipyscikit-learnCythonh5pytabulatetqdmPyYAMLabsl-pyLudwig has been developed and tested with Python 3 in mind.
If you don’t have Python 3 installed, install it by running:sudo apt install python3  # on ubuntu
brew install python3      # on macYou may want to use a virtual environment to maintain an isolatedPython environment.virtualenv -p python3 venvIn order to install Ludwig just run:pip install ludwigor install it by building the source code from the repository:git clone git@github.com:uber/ludwig.git
cd ludwig
virtualenv -p python3 venv
source venv/bin/activate
pip install -r requirements.txt
python setup.py installThis will install only Ludwig-s basic requirements, different feature types require different dependencies.
We divided them as different extras so that users could install only the ones they actually need.Text features extra packages can be installed withpip install ludwig[text]and include:spacybert-tensorflowIf you intend to use text features and want to usespaCybased language tokenizers, install language specific models with:python -m spacy download <language_code>More details in theUser Guide.Image features extra packages can be installed withpip install ludwig[image]and include:scikit-imageAudio features extra packages can be installed withpip install ludwig[audio]and include:soundfileVisualization extra packages can be installed withpip install ludwig[viz]and include:matplotlibseabornModel serving extra packages can be installed withpip install ludwig[serve]and include:fastapiuvicornpydanticpython-multipartAny combination of extra packages can be installed at the same time withpip install ludwig[extra1,extra2,...]like for instancepip install ludwig[text,viz].
The full set of dependencies can be installed withpip install ludwig[full].Beware that in therequirements.txtfile thetensorflowpackage is the regular one, not the GPU enabled one.
To install the GPU enabled one, uninstalltensorflowand replace it withtensorflow-gpuafter installation.If you want to train Ludwig models in a distributed way, you need to also install thehorovodand thempi4pypackages.
Please follow the instructions onHorovod's repositoryto install it.Basic PrinciplesLudwig provides two main functionalities: training models and using them to predict.
It is based on datatype abstraction, so that the same data preprocessing and postprocessing will be performed on different datasets that share data types and the same encoding and decoding models developed for one task can be reused for different tasks.Training a model in Ludwig is pretty straightforward: you provide a CSV dataset and a model definition YAML file.The model definition contains a list of input features and output features, all you have to do is specify names of the columns in the CSV that are inputs to your model alongside with their datatypes, and names of columns in the CSV that will be outputs, the target variables which the model will learn to predict.
Ludwig will compose a deep learning model accordingly and train it for you.Currently the available datatypes in Ludwig are:binarynumericalcategorysetbagsequencetexttimeseriesimageaudiodateh3vectorThe model definition can contain additional information, in particular how to preprocess each column in the CSV, which encoder and decoder to use for each one, feature hyperparameters and training parameters.
This allows ease of use for novices and flexibility for experts.TrainingFor example, given a text classification dataset like the following:doc_textclassFormer president Barack Obama ...politicsJuventus hired Cristiano Ronaldo ...sportLeBron James joins the Lakers ...sport......you want to learn a model that uses the content of thedoc_textcolumn as input to predict the values in theclasscolumn.
You can use the following model definition:{input_features:[{name:doc_text,type:text}],output_features:[{name:class,type:category}]}and start the training typing the following command in your console:ludwig train --data_csv path/to/file.csv --model_definition "{input_features: [{name: doc_text, type: text}], output_features: [{name: class, type: category}]}"wherepath/to/file.csvis the path to a UTF-8 encoded CSV file contaning the dataset in the previous table.
Ludwig will perform a random split of the data, preprocess it, build a WordCNN model (the default for text features) that decodes output classes through a softmax classifier, train the model on the training set until the accuracy on the validation set stops improving.
Training progress will be displayed in the console, but TensorBoard can also be used.If you prefer to use an RNN encoder and increase the number of epochs you want the model to train for, all you have to do is to change the model definition to:{input_features:[{name:doc_text,type:text,encoder:rnn}],output_features:[{name:class,type:category}],training:{epochs:50}}Refer to theUser Guideto find out all the options available to you in the model definition and take a look at theExamplesto see how you can use Ludwig for several different tasks.After training, Ludwig will create a directory underresultscontaining the trained model with its hyperparameters and summary statistics of the training process.
You can visualize them using one of the several visualization options available in thevisualizetool, for instance:ludwig visualize --visualization learning_curves --training_statistics path/to/training_statistics.jsonThe commands will display a graph that looks like the following, where you can see loss and accuracy as functions of train iteration number:Several visualizations are available, please refer toVisualizationsfor more details.Distributed TrainingYou can distribute the training of your models usingHorovod, which allows to train on a single machine with multiple GPUs as well as on multiple machines with multiple GPUs.
Refer to theUser Guidefor more details.PredictIf you have new data and you want your previously trained model to predict target output values, you can type the following command in your console:ludwig predict --data_csv path/to/data.csv --model_path /path/to/modelRunning this command will return model predictions and some test performance statistics if the dataset contains ground truth information to compare to.
Those can be visualized by thevisualizetool, which can also be used to compare performances and predictions of different models, for instance:ludwig visualize --visualization compare_performance --test_statistics path/to/test_statistics_model_1.json path/to/test_statistics_model_2.jsonwill return a bar plot comparing the models on different measures:A handyludwig experimentcommand that performs training and prediction one after the other is also available.Programmatic APILudwig also provides a simple programmatic API that allows you to train or load a model and use it to obtain predictions on new data:fromludwig.apiimportLudwigModel# train a modelmodel_definition={...}model=LudwigModel(model_definition)train_stats=model.train(training_dataframe)# or load a modelmodel=LudwigModel.load(model_path)# obtain predictionspredictions=model.predict(test_dataframe)model.close()model_definitionis a dictionary contaning the same information of the YAML file.
More details are provided in theUser Guideand in theAPI documentation.ExtensibilityLudwig is built from the ground up with extensibility in mind.
It is easy to add an additional datatype that is not currently supported by adding a datatype-specific implementation of abstract classes which contain functions to preprocess the data, encode it, and decode it.Furthermore, new models, with their own specific hyperparameters, can be easily added by implementing a class that accepts tensors (of a specific rank, depending of the datatype) as inputs and provides tensors as output.
This encourages reuse and sharing new models with the community.
Refer to theDeveloper Guidefor further details.Full documentationYou can find the full documentationhere.