DeepSpeedPrecisionPlugin

class lightning.pytorch.plugins.precision.DeepSpeedPrecisionPlugin(precision)

Bases: PrecisionPlugin

Precision plugin for DeepSpeed integration.

Warning

This is an experimental feature.

Parameters:

precision (Literal['32-true', '16-true', 'bf16-true', '16-mixed', 'bf16-mixed']) – Full precision (32-true), half precision (16-true, bf16-true) or mixed precision (16-mixed, bf16-mixed).

Raises:

ValueError – If unsupported precision is provided.

backward(tensor, model, optimizer, *args, **kwargs)

Performs back-propagation using DeepSpeed’s engine.

Parameters:

• tensor (Tensor) – the loss tensor

• model (LightningModule) – the model to be optimized

• optimizer (Optional[Steppable]) – ignored for DeepSpeed

• *args (Any) – additional positional arguments for the deepspeed.DeepSpeedEngine.backward() call

• **kwargs (Any) – additional keyword arguments for the deepspeed.DeepSpeedEngine.backward() call

Return type:

None

clip_gradients(optimizer, clip_val=0.0, gradient_clip_algorithm=GradClipAlgorithmType.NORM)

DeepSpeed handles gradient clipping internally.

Return type:

None

convert_input(data)

Convert model inputs (forward) to the floating point precision type of this plugin.

This is a no-op in the base precision plugin, since we assume the data already has the desired type (default is torch.float32).

Return type:

Any

convert_module(module)

Convert the module parameters to the precision type this plugin handles.

This is optional and depends on the precision limitations during optimization.

Return type:

Module

module_init_context()

Instantiate module parameters or tensors in the precision type this plugin handles.

This is optional and depends on the precision limitations during optimization.

Return type:

ContextManager

optimizer_step(optimizer, model, closure, **kwargs)

Hook to run the optimizer step.

Return type:

Any

tensor_init_context()

Controls how tensors get created (device, dtype).

Return type:

ContextManager