tf.contrib.mixed_precision.LossScaleManager

Abstract loss scale manager class.

Loss scale managers with a different strategy should subclass this class. Loss scaling is a process that:

1) Applies a multiplier on the loss before computing gradients, and 2) Applies the reciprocal of the multiplier on the gradients before they are applied on variables.

This class is used together with tf.contrib.mixed_precision.LossScaleOptimizer for mixed precision training (float32 variables and float16 ops) on Nvidia GPUs in order to achieve the same model quality as single precision training, with the benefits of potential higher throughput.

See tf.contrib.mixed_precision.LossScaleOptimizer for more details.

Methods

get_loss_scale

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@abc.abstractmethod
get_loss_scale()

Returns the loss scale as a scalar float32 tensor.

update_loss_scale

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@abc.abstractmethod
update_loss_scale(
    finite_grads
)

Updates loss scale based on if gradients are finite in current step.

Args
finite_grads	bool scalar tensor indicating if all gradients are finite (i.e., not inf or nan).

Returns
An op, when executed updates the loss scale. If eager execution is enabled, does not return anything.