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MNIST in TensorFlow

This repository demonstrates using Paperspace Gradient to train and deploy a deep learning model to recognize handwritten characters, which is a canonical sample problem in machine learning.

We build a convolutional neural network to classify the MNIST dataset using the tf.data, tf.estimator.Estimator, and tf.layers APIs.

Gradient Setup

Single Node Training on Gradient

Install Gradient CLI

pip install -U gradient

Please check our documentation on how to install Gradient CLI and obtain an API Key

Create project and get the project id

Please check our documentation on how to create a project and get the project id Your project ID will look like pr1234567.

Create and start a workflow

gradient workflows create --name mnist-sample --projectId pr1234567
+--------------+--------------------------------------+
| Name         | ID                                   |
+--------------+--------------------------------------+
| mnist-sample | 12345678-1234-1234-1234-1234567890ab |
+--------------+--------------------------------------+

Clone this repo, and change directoru into it, or copy mnist-sample.yaml to your local machine.

Then run the workflow using the workflow ID from the create workflow command above.

gradient workflows run --id 12345678-1234-1234-1234-1234567890ab --path mnist-sample.yaml

That's it!

Exporting a Model for inference

Export your Tensorflow model

In order to serve a Tensorflow model, simply export a SavedModel from your Tensorflow program. SavedModel is a language-neutral, recoverable, hermetic serialization format that enables higher-level systems and tools to produce, consume, and transform TensorFlow models.

Please refer to Tensorflow documentation for detailed instructions on how to export SavedModels.

Example code showing how to export your model:

tf.estimator.train_and_evaluate(mnist_classifier, train_spec, eval_spec)

#Starting to Export model
image = tf.placeholder(tf.float32, [None, 28, 28])
input_fn = tf.estimator.export.build_raw_serving_input_receiver_fn({
            'image': image,
        })
mnist_classifier.export_savedmodel(<export directory>,
                                    input_fn,
                                    strip_default_attrs=True)
#Model Exported

We use TensorFlow's SavedModelBuilder module to export the model. SavedModelBuilder saves a "snapshot" of the trained model to reliable storage so that it can be loaded later for inference.

For details on the SavedModel format, please see the documentation at SavedModel README.md.

For export directory, be sure to set it to PS_MODEL_PATH when running a model deployment on Gradient:

export_dir = os.path.abspath(os.environ.get('PS_MODEL_PATH'))

You can also use Gradient SDK to ensure you have the correct path:

from gradient_sdk.utils import data_dir, model_dir, export_dir

(Optional) Local Setup using a Virtual Environment

Users sometimes run into local machine environment issues when trying to use Python. A common solution for this is to create and use a Python virtual environment to run Python from within. To do so:

  1. Create and activate a Python virtual environment (we recommend using python3.7+):
cd mnist-sample

python3 -m venv venv

source venv/bin/activate
  1. Install the required Python packages:
pip install -r requirements-local.txt

Local Training

To train a the mnist model locally:

  1. Make sure you have the latest version of TensorFlow installed.

  2. Also make sure you've added the models folder to your Python path; otherwise you may encounter an error like ImportError: No module named mnist.

  3. Download the code from GitHub:

git clone git@github.com:Paperspace/mnist-sample.git
  1. Start training the model:
python mnist.py

Note: local training will take a long time, so be prepared to wait!

If you want to shorten model training time, you can change the max steps parameter:

python mnist.py --max_steps=1500

The mnist dataset is downloaded to the ./data directory.

Model results are stored in the ./models directory.

Both directories can be safely deleted if you would like to start the training over from the beginning.

Exporting the model to a specific directory

You can export the model into a specific directory, in the Tensorflow SavedModel format, by using the argument --export_dir:

python mnist.py --export_dir /tmp/mnist_saved_model

If no export directory is specified, the model is saved to a timestamped directory under ./models subdirectory (e.g. mnist-sample/models/1513630966/).

Testing a Tensorflow Serving-deployed model on your local machine using Docker

Open another terminal window and run the following in the directory where you cloned this repo:

docker run -t --rm -p 8501:8501 -v "$PWD/models:/models/mnist" -e MODEL_NAME=mnist tensorflow/serving

Now you can test the local inference endpoint by running:

python serving_rest_client_test.py

Optionally you can provide a path to an image file to run a prediction on:

python serving_rest_client_test.py --path example3.png

Once you've completed local testing using the tensorflow/serving docker container, stop the running container as follows:

docker ps
docker kill <container-id-or-name>

Training the model on a node with a GPU for use with Tensorflow Serving on a node with only a CPU

If you are training on Tensorflow using a GPU but would like to export the model for use in Tensorflow Serving on a CPU-only server, you can train and/or export the model using --data_format=channels_last:

python mnist.py --data_format=channels_last

The SavedModel will be saved in a timestamped directory under models subdirectory (e.g. mnist-sample/models/1513630966/).

Inspecting and getting predictions with the SavedModel file

You can also use the saved_model_cli tool to inspect and execute the SavedModel.