How To Use The Learning Rate Warm Up In Tensorflow With Keras

Learn through the super-clean Baeldung Pro experience: No ads, dark-mode and 6 months free of IntelliJ Idea Ultimate to start with. When we’re training neural networks, choosing the learning rate (LR) is a crucial step. This value defines how each pass on the gradient changes the weights in each layer. In this tutorial, we’ll show how different strategies for defining the LR affect the accuracy of a model. We’ll consider the warm-up scenario, which only includes a few initial iterations.

For a more theoretical aspect of it, we refer to another article of ours. Here, we’ll focus on the implementation aspects and performance comparison of different approaches. To keep things simple, we use the well-known fashion MNIST dataset. Let’s start by loading the required libraries and this computer vision dataset with labels: The learning rate is an important hyperparameter in deep learning networks - and it directly dictates the degree to which updates to weights are performed, which are estimated to minimize some given loss function. In SGD:

$$ weight_{t+1} = weight_t - lr * \frac{derror}{dweight_t} $$ With a learning rate of 0, the updated weight is just back to itself - weightt. The learning rate is effectively a knob we can turn to enable or disable learning, and it has major influence over how much learning is happening, by directly controlling the degree of weight updates. Different optimizers utilize learning rates differently - but the underlying concept stays the same. Needless to say, learning rates have been the object of many studies, papers and practitioner's benchmarks. Generally speaking, pretty much everyone agrees that a static learning rate won't cut it, and some type of learning rate reduction happens in most techniques that tune the learning rate during training - whether...

You can use a learning rate schedule to modulate how the learning rate of your optimizer changes over time. Several built-in learning rate schedules are available, such as keras.optimizers.schedules.ExponentialDecay or keras.optimizers.schedules.PiecewiseConstantDecay: A LearningRateSchedule instance can be passed in as the learning_rate argument of any optimizer. To implement your own schedule object, you should implement the __call__ method, which takes a step argument (scalar integer tensor, the current training step count). Like for any other Keras object, you can also optionally make your object serializable by implementing the get_config and from_config methods. Instantiates a LearningRateSchedule from its config.

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Connect and share knowledge within a single location that is structured and easy to search. A LearningRateSchedule that uses a cosine decay with optional warmup. See Loshchilov & Hutter, ICLR2016, SGDR: Stochastic Gradient Descent with Warm Restarts. For the idea of a linear warmup of our learning rate, see Goyal et al.. When we begin training a model, we often want an initial increase in our learning rate followed by a decay. If warmup_target is an int, this schedule applies a linear increase per optimizer step to our learning rate from initial_learning_rate to warmup_target for a duration of warmup_steps.

Afterwards, it applies a cosine decay function taking our learning rate from warmup_target to alpha for a duration of decay_steps. If warmup_target is None we skip warmup and our decay will take our learning rate from initial_learning_rate to alpha. It requires a step value to compute the learning rate. You can just pass a backend variable that you increment at each training step. The schedule is a 1-arg callable that produces a warmup followed by a decayed learning rate when passed the current optimizer step. This can be useful for changing the learning rate value across different invocations of optimizer functions.

| How to use learning rate schedules in TensorFlow? Discover how to implement learning rate schedules in TensorFlow to optimize your model training and improve performance with this comprehensive guide. Defining Learning Rate Schedules in TensorFlow Practical Use of Learning Rate Schedules Implementing Custom Learning Rate Schedules

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