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TensorFlow Estimator Template

This repository contains a simple TensorFlow model for classification which utilise the tensorflow.estimator submodule. This is an example of a very flexible pipeline written using core TensorFlow constructs.

Typical usage of this template would involve making minor modifications to all of it's files. It is more like an example of how to create a simple TensorFlow training and evaluation pipeline without writing some tedious tasks by hand (like epochs loop, batches loop, examples shuffling and storing/restoring checkpoints).

For more detailed example see: https://www.tensorflow.org/extend/estimators.

Sample problem

For completeness the example solves iris classification problem using 4 numerical features. The dataset is available in the tensorflow.contrib.learn.dataset.

Files

  • __main__.py - usage example.
  • io_utils.py - data input utilities. Implements loading the iris dataset, splitting it into train/test subsets and preparing an input_fn with epochs limit and batching.
  • cli.py - utilities for creating rich CLI
  • model.py - contains model_fn where the actual neural network is being built (a simple 3-layer perceptron with a tanh activation function).

Output Example

Usage has been shown in the __main__.py. To run invoke python3 -m iris train from the repository's root. A sample output has been placed below (TensorFlow logs has been omitted).

Train set accuracy: 0.9733333587646484
Test set accuracy: 0.9466666579246521

Prediction results:
000000000000000000000000011111111111111112111111112222222222222211122222222
000000000000000000000000011111111111111111111111112222222222222222222222222
                                         !                      !!!

Prediction results consist of a line of concatenated predictions and a line of concatenated true values for comparison.

Models saving and restoring

All trained models are automatically stored on the disk in a directory designated by TENSORFLOW_MODELS_DIR environment variable. If it is not defined a platform-specific temporary directory is used (e.g. /tmp/tf_models on Linux).

The -n option can be used in order to manually assign a name to the model. Otherwise the name is generated randomly. The name can be used to refer to a model in future runs to perform further training or evaluation. It is also used as model's subdirectory name in the models directory which is useful for manually inspecting the model files or when using the Tensorboard.

Overriding model parameters

Model parameters can be overridden by passing -p option and a list of overrides as key-value pairs. E.g. -p batch_size=10 num_epochs=200 would override default batch_size and num_epochs parameters. This feature uses a very primitive parser which require simple expression as shown in the example, i.e. no spaces around the = or within a parameter's key. The value is parsed as a Python literal.

All model parameters are stored within it's directory (model_dir) and used as defaults on its next usage. CLI parameters take precedence over parameters stored in model_dir which in turn take precedence over parameters hardcoded in the model's DEFAULT_PARAMS.