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tflite_runtime, but easier.

Project description

tflit 🔥

Because WTH tflite_runtime?

interpreter.invoke()? interpreter.set_tensor(input_details[0]['index'], X)?

Having to select a platform-specific url from here?

Uh no. certainly not 🔥.

What this does:

  • Detects your platform + Python version so you don't have to pick the right url and you can add tflite_runtime as a dependency without having to pick a single platform to support.
  • Creates a familiar keras-like interface for models, so you can do tflit.Model(path).predict(X) without ever having to think about tensor indexes or three step predictions, or batching.


pip install tflit


I tried to provide an interface as similar to Keras as possible.

import tflit

model = tflit.Model('path/to/model.tflite')
model.summary()  # prints input and output details

print(model.input_shape)   # (10, 30)  - a single input
print(model.output_shape)  # [(5, 2), (1, 2)]  - two outputs
print(model.dtype)         # 'float32'

# *see notes below
print(model.input_names)   # may not preserve names (based on how you export)
print(model.output_names)  # doesn't preserve names atm

# predict over batches of outputs.
y_pred = model.predict(np.random.randn(32, 10, 30))

# predict single output at a time
y_pred = model.predict_batch(np.random.randn(1, 10, 30))


  • It's possible that tflite_runtime may not have a build for your system. Check this link to verify.

  • There's a bug with the current tflite converter where it doesn't copy over the input and output names.

    However, if you do this when you're exporting, the input names will be saved:

    converter = tf.lite.TFLiteConverter.from_keras_model(model)
    converter.experimental_new_converter = True  # <<< this
    tflite_model = converter.convert()

    But still no luck with the output names :/. To be clear, this is a tensorflow issue and I have no control over this.

  • I intended to have a model.set_batch_size method to change the batch size at runtime, but it doesn't currently work because tflite freaks out about there being an increased tensor size (it doesn't know how to broadcast). This is also a tensorflow issue.

    For the time being, we just compute one batch at a time and concatenate them at the end. If the model's fixed batch size doesn't divide evenly, it will throw an error. By default, tflite converts None batch sizes to 1 so most of the time it won't be a problem. To compute a single frame, it is more efficient to use model.predict_batch(X) directly.

I would love to get both of these resolved, but they are out of my control and I don't really have the bandwidth or the urgent need to have these resolved.

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