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# LAMB
[LAMB (Layerwise adaptive large batch optimization)](https://hf.co/papers/1904.00962) is an adaptive optimizer designed for training with large batch sizes to accelerate training, combining ideas from `LARS` and `Adam` to automatically scale the learning rate for each layer:
- calculates a *trust ratio* between the weight and gradient norm in a layer and clips the ratio to prevent overly large or small updates
- updates weights with the first and second-moments
## LAMB[[api-class]][[bitsandbytes.optim.LAMB]]
- **params** (`torch.tensor`) --
The input parameters to optimize.
- **lr** (`float`, defaults to 1e-3) --
The learning rate.
- **bias_correction** (`bool`, defaults to `True`) --
Whether to apply bias correction to the first and second-order moments.
- **betas** (`tuple(float, float)`, defaults to (0.9, 0.999)) --
The beta values are the decay rates of the first and second-order moment of the optimizer.
- **eps** (`float`, defaults to 1e-8) --
The epsilon value prevents division by zero in the optimizer.
- **weight_decay** (`float`, defaults to 1e-2) --
The weight decay value for the optimizer.
- **amsgrad** (`bool`, defaults to `False`) --
Whether to use the [AMSGrad](https://hf.co/papers/1904.09237) variant of Adam that uses the maximum of past squared gradients instead.
- **adam_w_mode** (`bool`, defaults to `True`) --
Whether to use the AdamW variant.
- **optim_bits** (`int`, defaults to 32) --
The number of bits of the optimizer state.
- **args** (`object`, defaults to `None`) --
An object with additional arguments.
- **min_8bit_size** (`int`, defaults to 4096) --
The minimum number of elements of the parameter tensors for 8-bit optimization.
- **max_unorm** (`float`, defaults to 1.0) --
The maximum gradient norm.
Base LAMB optimizer.
## LAMB8bit[[bitsandbytes.optim.LAMB8bit]]
- **params** (`torch.tensor`) --
The input parameters to optimize.
- **lr** (`float`, defaults to 1e-3) --
The learning rate.
- **bias_correction** (`bool`, defaults to `True`) --
Whether to apply bias correction to the first and second-order moments.
- **betas** (`tuple(float, float)`, defaults to (0.9, 0.999)) --
The beta values are the decay rates of the first and second-order moment of the optimizer.
- **eps** (`float`, defaults to 1e-8) --
The epsilon value prevents division by zero in the optimizer.
- **weight_decay** (`float`, defaults to 1e-2) --
The weight decay value for the optimizer.
- **amsgrad** (`bool`, defaults to `False`) --
Whether to use the [AMSGrad](https://hf.co/papers/1904.09237) variant of Adam that uses the maximum of past squared gradients instead.
- **adam_w_mode** (`bool`, defaults to `True`) --
Whether to use the AdamW variant.
- **args** (`object`, defaults to `None`) --
An object with additional arguments.
- **min_8bit_size** (`int`, defaults to 4096) --
The minimum number of elements of the parameter tensors for 8-bit optimization.
- **max_unorm** (`float`, defaults to 1.0) --
The maximum gradient norm.
8-bit LAMB optimizer.
## LAMB32bit[[bitsandbytes.optim.LAMB32bit]]
- **params** (`torch.tensor`) --
The input parameters to optimize.
- **lr** (`float`, defaults to 1e-3) --
The learning rate.
- **bias_correction** (`bool`, defaults to `True`) --
Whether to apply bias correction to the first and second-order moments.
- **betas** (`tuple(float, float)`, defaults to (0.9, 0.999)) --
The beta values are the decay rates of the first and second-order moment of the optimizer.
- **eps** (`float`, defaults to 1e-8) --
The epsilon value prevents division by zero in the optimizer.
- **weight_decay** (`float`, defaults to 1e-2) --
The weight decay value for the optimizer.
- **amsgrad** (`bool`, defaults to `False`) --
Whether to use the [AMSGrad](https://hf.co/papers/1904.09237) variant of Adam that uses the maximum of past squared gradients instead.
- **adam_w_mode** (`bool`, defaults to `True`) --
Whether to use the AdamW variant.
- **args** (`object`, defaults to `None`) --
An object with additional arguments.
- **min_8bit_size** (`int`, defaults to 4096) --
The minimum number of elements of the parameter tensors for 8-bit optimization.
- **max_unorm** (`float`, defaults to 1.0) --
The maximum gradient norm.
32-bit LAMB optimizer.

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