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Working with Keras#

Open in Colab

Custom dashboard displaying metadata logged with Keras

Keras is an API built on top of TensorFlow.

The Neptune–Keras integration logs the following metadata automatically:

  • Model summary
  • Parameters of the optimizer used for training the model
  • Parameters passed to Model.fit during the training
  • Current learning rate at every epoch
  • Hardware consumption and stdout/stderr output during training
  • Training code and Git information

You can also use set the log_model_diagram option to True to save the model visualization produced by the Keras functions model_to_dot() and plot_model().

See example in Neptune  Code examples 

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Before you start#

Tip

If you'd rather follow the guide without any setup, you can run the example in Colab .

Installing the Neptune–Keras integration#

On the command line or in a terminal app, such as Command Prompt, enter the following:

pip install -U neptune-tensorflow-keras

conda install -c conda-forge neptune-tensorflow-keras

Keras logging example#

This example shows how to use NeptuneCallback to log metadata as you train your model with Keras.

  1. Create a run:

    import neptune

run = neptune.init_run()  # (1)!
    1. If you haven't set up your credentials, you can log anonymously: neptune.init_run(api_token=neptune.ANONYMOUS_API_TOKEN, project="common/tf-keras-integration")

  2. Initialize the Neptune callback and pass it to model.fit():

    from neptune.integrations.tensorflow_keras import NeptuneCallback

neptune_callback = NeptuneCallback(run=run)  # (1)!

model.fit(
    x_train,
    y_train,
    epochs=5,
    batch_size=64,
    callbacks=[neptune_callback],
)
    1. You can customize the base namespace (folder) of your logged metadata here, by supplying the base_namespace argument and setting it to a name of your choice. The default is "training".

  3. Run your script as you normally would.

    To open the run, click the Neptune link that appears in the console output.

    Example link: https://app.neptune.ai/o/common/org/tf-keras-integration/e/TFK-18

  4. Monitor your Keras training in Neptune.

    In the left pane of the run view, select Charts to watch the training metrics live.

    Tip

    You can monitor the hardware consumption in the Monitoring section.

Stop the run when done

Once you are done logging, you should stop the Neptune run. You need to do this manually when logging from a Jupyter notebook or other interactive environment:

run.stop()

If you're running a script, the connection is stopped automatically when the script finishes executing. In notebooks, however, the connection to Neptune is not stopped when the cell has finished executing, but rather when the entire notebook stops.

More options#

Enabling logging on batch#

You can set the callback to log metrics for each batch, in addition to each epoch, by tweaking the callback:

neptune_callback = NeptuneCallback(run=run, log_on_batch=True)

Saving the model visualization#

You can save the model visualization diagram by setting the log_model_diagram parameter to True.

Note

This option requires pydot to be installed.

import neptune
from neptune.integrations.tensorflow_keras import NeptuneCallback

run = neptune.init_run()

neptune_callback = NeptuneCallback(run=run, log_model_diagram=True)

Logging model weights#

You can log model weights to Neptune both during and after training.

  • To have all the metadata in a single place, you can log model metadata to the same run you created earlier.
  • To manage your model metadata separately, you can use the Neptune model registry.
import glob

model.save("my_model")

run["my_model/saved_model"].upload("my_model/saved_model.pb")

for name in glob.glob("my_model/variables/*"):
    run[name].upload(name)

Initialize a ModelVersion object.

You first need to create a Model object that functions as an umbrella for all the versions. You can create and manage each model version separately.

neptune_model = neptune.init_model(key="PRETRAINED")

Create a specific version of that model by passing the model ID:

model_id = neptune_model["sys/id"].fetch()
model_version = neptune.init_model_version(model=model_id)

Log metadata to the model version, just like you would for runs:

import glob

model.save("my_model")
model_version["saved_model"].upload("my_model/saved_model.pb")

for name in glob.glob("variables/*"):
    model_version[name].upload(name)

Result

The model metadata will now be displayed in the Models tab of the app.

For more, see the Model registry overview.

Uploading checkpoints every epoch#

You can set up the ModelCheckpoint to save a new checkpoint every epoch:

checkpoint_cbk = ModelCheckpoint(
    filepath,
    monitor: str = "val_loss",
    save_freq="epoch",
) 

...

Then upload each checkpoint file during or after training:

for name in glob.glob(filepath):
    run[name].upload(name)

Logging test sample images#

You can log sample images to Neptune with the append() method, which will create a series of images.

from neptune.types import File

for image in x_test[:100]:
    run["test/sample_images"].append(File.as_image(image))

See in Neptune 

Manually logging metadata#

If you have other types of metadata that are not covered in this guide, you can still log them using the Neptune client library.

When you initialize the run, you get a run object, to which you can assign different types of metadata in a structure of your own choosing.

import neptune
from neptune.integrations.tensorflow_keras import NeptuneCallback

# Create a new Neptune run
run = neptune.init_run()

# Log metrics using NeptuneCallback
neptune_callback = NeptuneCallback(run=run)
model.fit(x_train, y_train, batch_size=32, callbacks=[neptune_callback])

# Use the same run to upload files
run["test/preds"].upload("path/to/test_preds.csv")

# Use the same run track and version artifacts
run["train/images"].track_files("./datasets/images")

# Use the same run to log numbers or text
run["tokenizer"] = "regexp_tokenize"

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