mindspore/docs/api/api_python/nn/mindspore.nn.WarmUpLR.rst

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mindspore.nn.WarmUpLR
======================
.. py:class:: mindspore.nn.WarmUpLR(learning_rate, warmup_steps)
学习率热身。
对于当前step计算warmup_learning_rate[current_step]的公式为:
.. math::
warmup\_learning\_rate[current\_step] = learning\_rate * tmp\_step / warmup\_steps
其中,
.. math:
tmp\_step=min(current\_step, warmup\_steps)
**参数:**
- **learning_rate** (float): 学习率的初始值。
- **warmup_steps** (int): 学习率warmup的step数。
**输入:**
- **global_step** (Tensor) - 当前step数。
**输出:**
Tensor。形状为 :math:`()` 的当前step的学习率值。
**异常:**
- **TypeError** - `learning_rate` 不是float。
- **TypeError** - `warmup_steps` 不是int。
- **ValueError** - `warmup_steps` 小于1。
- **ValueError** - `learning_rate` 小于或等于0。
**支持平台:**
``Ascend`` ``GPU``
**样例:**
>>> import mindspore
>>> from mindspore import Tensor, nn
>>>
>>> learning_rate = 0.1
>>> warmup_steps = 2
>>> global_step = Tensor(2, mindspore.int32)
>>> warmup_lr = nn.WarmUpLR(learning_rate, warmup_steps)
>>> result = warmup_lr(global_step)
>>> print(result)
0.1