# Copyright 2023 Huawei Technologies Co., Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
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# ============================================================================
"""adagrad"""
from __future__ import absolute_import
from mindspore.ops import functional as F, composite as C, operations as P
from mindspore.common import Tensor, Parameter
import mindspore.common.dtype as mstype
from mindspore.experimental.optim.optimizer import Optimizer, check_not_less_than, check_not_less_than_without_equal
from mindspore import jit
_adagrad_opt = C.MultitypeFuncGraph("adagrad_opt")
@_adagrad_opt.register("Function", "Tensor", "Tensor", "Tensor", "Tensor")
def _tensor_run_opt(opt, learning_rate, weight, accum, gradient):
"""Apply adagrad optimizer to the weight parameter."""
success = True
success = F.depend(success, opt(weight, accum, learning_rate, gradient))
return success
[docs]class Adagrad(Optimizer):
r"""
Implements Adagrad algorithm.
.. math::
\begin{aligned}
&\rule{110mm}{0.4pt} \\
&\textbf{input} : \gamma \text{ (lr)}, \: \theta_0 \text{ (params)}, \: f(\theta)
\text{ (objective)}, \: \lambda \text{ (weight decay)}, \\
&\hspace{12mm} \tau \text{ (initial accumulator value)}, \: \eta\text{ (lr decay)}\\
&\textbf{initialize} : state\_sum_0 \leftarrow 0 \\[-1.ex]
&\rule{110mm}{0.4pt} \\
&\textbf{for} \: t=1 \: \textbf{to} \: \ldots \: \textbf{do} \\
&\hspace{5mm}g_t \leftarrow \nabla_{\theta} f_t (\theta_{t-1}) \\
&\hspace{5mm} \tilde{\gamma} \leftarrow \gamma / (1 +(t-1) \eta) \\
&\hspace{5mm} \textbf{if} \: \lambda \neq 0 \\
&\hspace{10mm} g_t \leftarrow g_t + \lambda \theta_{t-1} \\
&\hspace{5mm}state\_sum_t \leftarrow state\_sum_{t-1} + g^2_t \\
&\hspace{5mm}\theta_t \leftarrow
\theta_{t-1}- \tilde{\gamma} \frac{g_t}{\sqrt{state\_sum_t}+\epsilon} \\
&\rule{110mm}{0.4pt} \\[-1.ex]
&\bf{return} \: \theta_t \\[-1.ex]
&\rule{110mm}{0.4pt} \\[-1.ex]
\end{aligned}
.. warning::
This is an experimental optimizer API that is subject to change.
This module must be used with lr scheduler module in `LRScheduler Class
<https://www.mindspore.cn/docs/en/r2.3.0/api_python/mindspore.experimental.html#lrscheduler-class>`_ .
Args:
params (Union[list(Parameter), list(dict)]): list of parameters to optimize or dicts defining
parameter groups.
lr (Union[int, float, Tensor], optional): learning rate. Default: ``1e-2``.
lr_decay (float, optional): learning rate decay. Default: ``0.``.
weight_decay (float, optional): weight decay (L2 penalty). Default: ``0.``.
initial_accumulator_value (float, optional): the initial accumulator value. Default: ``0.``.
eps (float, optional): term added to the denominator to improve
numerical stability. Default: ``1e-10``.
Keyword Args:
maximize (bool, optional): maximize the params based on the objective, instead of minimizing.
Default: ``False``.
Inputs:
- **gradients** (tuple[Tensor]) - The gradients of `params`.
Raises:
ValueError: If the learning rate is not int, float or Tensor.
ValueError: If the learning rate is less than 0.
ValueError: If the learning rate decay is less than 0.
ValueError: If the `weight_decay` is less than 0.
ValueError: If the `initial_accumulator_value` is less than 0.0.
ValueError: If the `eps` is less than 0.0.
Supported Platforms:
``Ascend`` ``GPU`` ``CPU``
Examples:
>>> import mindspore
>>> from mindspore import nn
>>> from mindspore.experimental import optim
>>> # Define the network structure of LeNet5. Refer to
>>> # https://gitee.com/mindspore/docs/blob/r2.3.0/docs/mindspore/code/lenet.py
>>> net = LeNet5()
>>> loss_fn = nn.SoftmaxCrossEntropyWithLogits(sparse=True)
>>> optimizer = optim.Adagrad(net.trainable_params(), lr=0.1)
>>> def forward_fn(data, label):
... logits = net(data)
... loss = loss_fn(logits, label)
... return loss, logits
>>> grad_fn = mindspore.value_and_grad(forward_fn, None, optimizer.parameters, has_aux=True)
>>> def train_step(data, label):
... (loss, _), grads = grad_fn(data, label)
... optimizer(grads)
... return loss
"""
def __init__(self, params, lr=1e-2, lr_decay=0.0, weight_decay=0.0, initial_accumulator_value=0.0,
eps=1e-10, *, maximize=False):
check_not_less_than_without_equal(lr, "lr", self.cls_name)
check_not_less_than(lr_decay, "lr_decay", self.cls_name)
check_not_less_than(weight_decay, "weight_decay", self.cls_name)
check_not_less_than(initial_accumulator_value, "initial_accumulator_value", self.cls_name)
check_not_less_than_without_equal(eps, "eps", self.cls_name)
defaults = dict(
lr=lr,
lr_decay=lr_decay,
eps=eps,
weight_decay=weight_decay,
initial_accumulator_value=initial_accumulator_value,
maximize=maximize,
)
super(Adagrad, self).__init__(params, defaults)
self.accum = self.parameters.clone(prefix="accum", init=initial_accumulator_value)
self.op_cast = P.Cast()
self.step_t = Parameter(Tensor(0, mstype.int32), "step_t")
self.increase_tensor = Tensor(1, mstype.int32)
self.assignadd = P.AssignAdd()
self.assign = P.Assign()
@jit
def implementation(self, eps, lr, lr_decay, maximize, weight_decay, start_id, end_id, gradients):
"""Extract the common computing part for acceleration"""
opt = P.ApplyAdagradV2(epsilon=eps, update_slots=True)
decay_lr = lr / (1 + self.step_t * lr_decay)
params = self.parameters[start_id: end_id]
grads = tuple([grad if not maximize else F.neg(grad) for grad in gradients[start_id: end_id]])
grads = self._decay_weight(weight_decay, params, grads)
accum = self.accum[start_id: end_id]
self.hyper_map(F.partial(_adagrad_opt, opt, decay_lr), params, accum, grads)
return True
def construct(self, gradients):
for group_id, group in enumerate(self.param_groups):
lr = self.lrs[group_id]
if isinstance(group.get("lr"), float):
lr = self.op_cast(group.get("lr"), mstype.float32)
lr_decay = group["lr_decay"]
maximize = group.get("maximize")
weight_decay = group["weight_decay"]
eps = group["eps"]
start_id = self.group_start_id[group_id]
end_id = self.group_start_id[group_id + 1]
self.implementation(eps, lr, lr_decay, maximize, weight_decay, start_id, end_id, gradients)
self.assignadd(self.step_t, self.increase_tensor)
return True