未验证 提交 ff926c43 编写于 作者: Q qingqing01 提交者: GitHub

Update paddle/metrics (#2614) (#2617)

* Update paddle/metrics

* Fix format

* Update Metric format
上级 5d432446
.. _cn_api_fluid_metrics_Accuracy:
Accuracy
-------------------------------
.. py:class:: paddle.fluid.metrics.Accuracy(name=None)
该接口用来计算多个mini-batch的平均准确率。Accuracy对象有两个状态value和weight。Accuracy的定义参照 https://en.wikipedia.org/wiki/Accuracy_and_precision 。
参数:
- **name** (str,可选) – 具体用法请参见 :ref:`api_guide_Name` ,一般无需设置,默认值为None。
返回:初始化后的 ``Accuracy`` 对象
返回类型:Accuracy
**代码示例**
.. code-block:: python
import paddle.fluid as fluid
# 假设有batch_size = 128
batch_size=128
accuracy_manager = fluid.metrics.Accuracy()
# 假设第一个batch的准确率为0.9
batch1_acc = 0.9
accuracy_manager.update(value = batch1_acc, weight = batch_size)
print("expect accuracy: %.2f, get accuracy: %.2f" % (batch1_acc, accuracy_manager.eval()))
# 假设第二个batch的准确率为0.8
batch2_acc = 0.8
accuracy_manager.update(value = batch2_acc, weight = batch_size)
#batch1和batch2的联合准确率为(batch1_acc * batch_size + batch2_acc * batch_size) / batch_size / 2
print("expect accuracy: %.2f, get accuracy: %.2f" % ((batch1_acc * batch_size + batch2_acc * batch_size) / batch_size / 2, accuracy_manager.eval()))
#重置accuracy_manager
accuracy_manager.reset()
#假设第三个batch的准确率为0.8
batch3_acc = 0.8
accuracy_manager.update(value = batch3_acc, weight = batch_size)
print("expect accuracy: %.2f, get accuracy: %.2f" % (batch3_acc, accuracy_manager.eval()))
.. py:method:: update(value, weight)
该函数使用输入的(value, weight)来累计更新Accuracy对象的对应状态,更新方式如下:
.. math::
\\ \begin{array}{l}{\text { self. value }+=\text { value } * \text { weight }} \\ {\text { self. weight }+=\text { weight }}\end{array} \\
参数:
- **value** (float|numpy.array) – mini-batch的正确率
- **weight** (int|float) – mini-batch的大小
返回:无
.. py:method:: eval()
该函数计算并返回累计的mini-batches的平均准确率。
返回:累计的mini-batches的平均准确率
返回类型:float或numpy.array
.. _cn_api_fluid_metrics_Auc:
Auc
-------------------------------
.. py:class:: paddle.fluid.metrics.Auc(name, curve='ROC', num_thresholds=4095)
**注意**:目前只用Python实现Auc,可能速度略慢
该接口计算Auc,在二分类(binary classification)中广泛使用。相关定义参考 https://en.wikipedia.org/wiki/Receiver_operating_characteristic#Area_under_the_curve 。
该接口创建四个局部变量true_positives, true_negatives, false_positives和false_negatives,用于计算Auc。为了离散化AUC曲线,使用临界值的线性间隔来计算召回率和准确率的值。用false positive的召回值高度计算ROC曲线面积,用recall的准确值高度计算PR曲线面积。
参数:
- **name** (str,可选) – 具体用法请参见 :ref:`api_guide_Name` ,一般无需设置,默认值为None。
- **curve** (str) - 将要计算的曲线名的详情,曲线包括ROC(默认)或者PR(Precision-Recall-curve)。
返回:初始化后的 ``Auc`` 对象
返回类型:Auc
**代码示例**:
.. code-block:: python
import paddle.fluid as fluid
import numpy as np
# 初始化auc度量
auc_metric = fluid.metrics.Auc("ROC")
# 假设batch_size为128
batch_num = 100
batch_size = 128
for batch_id in range(batch_num):
class0_preds = np.random.random(size = (batch_size, 1))
class1_preds = 1 - class0_preds
preds = np.concatenate((class0_preds, class1_preds), axis=1)
labels = np.random.randint(2, size = (batch_size, 1))
auc_metric.update(preds = preds, labels = labels)
# 应为一个接近0.5的值,因为preds是随机指定的
print("auc for iteration %d is %.2f" % (batch_id, auc_metric.eval()))
.. py:method:: update(preds, labels)
用给定的预测值和标签更新Auc曲线。
参数:
- **preds** (numpy.array) - 维度为[batch_size, 2],preds[i][j]表示将实例i划分为类别j的概率。
- **labels** (numpy.array) - 维度为[batch_size, 1],labels[i]为0或1,代表实例i的标签。
返回:无
.. py:method:: eval()
该函数计算并返回Auc值。
返回:Auc值
返回类型:float
......@@ -5,55 +5,102 @@ Accuracy
.. py:class:: paddle.metric.Accuracy()
计算准确率(accuracy)
Encapsulates accuracy metric logic.
参数
参数:
:::::::::
topk (int|tuple(int)): Number of top elements to look at
for computing accuracy. Default is (1,).
name (str, optional): String name of the metric instance. Default
is `acc`.
- **topk** (int|tuple(int)) - 计算准确率的top个数,默认是1
- **name** (str, optional) - metric实例的名字,默认是'acc'
**代码示例**
Example by standalone:
# 独立使用示例:
.. code-block:: python
import numpy as np
import paddle
import numpy as np
import paddle
paddle.disable_static()
x = paddle.to_tensor(np.array([
[0.1, 0.2, 0.3, 0.4],
[0.1, 0.4, 0.3, 0.2],
[0.1, 0.2, 0.4, 0.3],
[0.1, 0.2, 0.3, 0.4]]))
y = paddle.to_tensor(np.array([[0], [1], [2], [3]]))
paddle.disable_static()
x = paddle.to_tensor(np.array([
[0.1, 0.2, 0.3, 0.4],
[0.1, 0.4, 0.3, 0.2],
[0.1, 0.2, 0.4, 0.3],
[0.1, 0.2, 0.3, 0.4]]))
y = paddle.to_tensor(np.array([[0], [1], [2], [3]]))
m = paddle.metric.Accuracy()
correct = m.compute(x, y)
m.update(correct)
res = m.accumulate()
print(res) # 0.75
m = paddle.metric.Accuracy()
correct = m.compute(x, y)
m.update(correct)
res = m.accumulate()
print(res) # 0.75
Example with Model API:
# Model API中的示例:
.. code-block:: python
import paddle
import paddle
paddle.disable_static()
train_dataset = paddle.vision.datasets.MNIST(mode='train')
model = paddle.Model(paddle.vision.LeNet(classifier_activation=None))
optim = paddle.optimizer.Adam(
learning_rate=0.001, parameters=model.parameters())
model.prepare(
optim,
loss=paddle.nn.CrossEntropyLoss(),
metrics=paddle.metric.Accuracy())
model.fit(train_dataset, batch_size=64)
.. py:function:: compute(pred, label, *args)
计算top-ktopk中的最大值)的索引。
参数:
:::::::::
- **pred** (Tensor) - 预测结果为是float64float32类型的Tensor
- **label** (Tensor) - 真实的标签值是一个2DTensorshape[batch_size, 1], 数据类型为int64
返回: 一个Tensorshape[batch_size, topk], 值为011表示预测正确.
.. py:function:: update(pred, label, *args)
更新metric的状态(正确预测的个数和总个数),以便计算累积的准确率。返回当前step的准确率。
paddle.disable_static()
train_dataset = paddle.vision.datasets.MNIST(mode='train')
参数:
:::::::::
- **correct** (numpy.array | Tensor): 一个值为01Tensorshape[batch_size, topk]
返回: 当前step的准确率。
.. py:function:: reset()
清空状态和计算结果。
返回
:::::::::
model = paddle.Model(paddle.vision.LeNet(classifier_activation=None))
optim = paddle.optimizer.Adam(
learning_rate=0.001, parameters=model.parameters())
model.prepare(
optim,
loss=paddle.nn.CrossEntropyLoss(),
metrics=paddle.metric.Accuracy())
model.fit(train_dataset, batch_size=64)
.. py:function:: accumulate()
\ No newline at end of file
累积的统计指标,计算和返回准确率。
返回
:::::::::
准确率,一般是个标量 多个标量,和topk的个数一致。
.. py:function:: name()
返回Metric实例的名字, 参考上述name,默认是'acc'
返回
:::::::::
评估的名字,string类型。
......@@ -5,85 +5,108 @@ Auc
.. py:class:: paddle.metric.Auc()
**注意**:目前只用Python实现Auc,可能速度略慢
The auc metric is for binary classification.
Refer to https://en.wikipedia.org/wiki/Receiver_operating_characteristic#Area_under_the_curve.
Please notice that the auc metric is implemented with python, which may be a little bit slow.
该接口计算Auc,在二分类(binary classification)中广泛使用。相关定义参考 https://en.wikipedia.org/wiki/Receiver_operating_characteristic#Area_under_the_curve
The `auc` function creates four local variables, `true_positives`,
`true_negatives`, `false_positives` and `false_negatives` that are used to
compute the AUC. To discretize the AUC curve, a linearly spaced set of
thresholds is used to compute pairs of recall and precision values. The area
under the ROC-curve is therefore computed using the height of the recall
values by the false positive rate, while the area under the PR-curve is the
computed using the height of the precision values by the recall.
该接口创建四个局部变量true_positives, true_negatives, false_positivesfalse_negatives,用于计算Auc。为了离散化AUC曲线,使用临界值的线性间隔来计算召回率和准确率的值。用false positive的召回值高度计算ROC曲线面积,用recall的准确值高度计算PR曲线面积。
参数
参数:
:::::::::
curve (str): Specifies the mode of the curve to be computed,
'ROC' or 'PR' for the Precision-Recall-curve. Default is 'ROC'.
num_thresholds (int): The number of thresholds to use when
discretizing the roc curve. Default is 4095.
'ROC' or 'PR' for the Precision-Recall-curve. Default is 'ROC'.
name (str, optional): String name of the metric instance. Default
is `auc`.
- **curve** (str) - 将要计算的曲线名的模式,包括'ROC'(默认)或者'PR'Precision-Recall-curve)。
- **num_thresholds** (int) - 离散化AUC曲线的整数阈值数,默认是4095
- **name** (str,可选) metric实例的名字,默认是'auc'
"NOTE: only implement the ROC curve type via Python now."
**代码示例**
Example by standalone:
.. code-block:: python
# 独立使用示例:
import numpy as np
import paddle
.. code-block:: python
m = paddle.metric.Auc()
n = 8
class0_preds = np.random.random(size = (n, 1))
class1_preds = 1 - class0_preds
preds = np.concatenate((class0_preds, class1_preds), axis=1)
labels = np.random.randint(2, size = (n, 1))
m.update(preds=preds, labels=labels)
res = m.accumulate()
import numpy as np
import paddle
m = paddle.metric.Auc()
n = 8
class0_preds = np.random.random(size = (n, 1))
class1_preds = 1 - class0_preds
preds = np.concatenate((class0_preds, class1_preds), axis=1)
labels = np.random.randint(2, size = (n, 1))
m.update(preds=preds, labels=labels)
res = m.accumulate()
Example with Model API:
# Model API中的示例:
.. code-block:: python
import numpy as np
import paddle
import paddle.nn as nn
class Data(paddle.io.Dataset):
def __init__(self):
super(Data, self).__init__()
self.n = 1024
self.x = np.random.randn(self.n, 10).astype('float32')
self.y = np.random.randint(2, size=(self.n, 1)).astype('int64')
def __getitem__(self, idx):
return self.x[idx], self.y[idx]
def __len__(self):
return self.n
paddle.disable_static()
model = paddle.Model(nn.Sequential(
nn.Linear(10, 2), nn.Softmax())
)
optim = paddle.optimizer.Adam(
learning_rate=0.001, parameters=model.parameters())
def loss(x, y):
return nn.functional.nll_loss(paddle.log(x), y)
model.prepare(
optim,
loss=loss,
metrics=paddle.metric.Auc())
data = Data()
model.fit(data, batch_size=16)
\ No newline at end of file
import numpy as np
import paddle
import paddle.nn as nn
class Data(paddle.io.Dataset):
def __init__(self):
super(Data, self).__init__()
self.n = 1024
self.x = np.random.randn(self.n, 10).astype('float32')
self.y = np.random.randint(2, size=(self.n, 1)).astype('int64')
def __getitem__(self, idx):
return self.x[idx], self.y[idx]
def __len__(self):
return self.n
paddle.disable_static()
model = paddle.Model(nn.Sequential(
nn.Linear(10, 2), nn.Softmax())
)
optim = paddle.optimizer.Adam(
learning_rate=0.001, parameters=model.parameters())
def loss(x, y):
return nn.functional.nll_loss(paddle.log(x), y)
model.prepare(
optim,
loss=loss,
metrics=paddle.metric.Auc())
data = Data()
model.fit(data, batch_size=16)
.. py:function:: update(pred, label, *args)
更新AUC计算的状态。
参数:
:::::::::
- **preds** (numpy.array | Tensor): 一个shape[batch_size, 2]Numpy数组或Tensorpreds[i][j]表示第i个样本类别为j的概率。
- **labels** (numpy.array | Tensor): 一个shape[batch_size, 1]Numpy数组或Tensorlabels[i]01,表示第i个样本的类别。
返回: 无。
.. py:function:: reset()
清空状态和计算结果。
返回:无
.. py:function:: accumulate()
累积的统计指标,计算和返回AUC值。
返回:AUC值,一个标量。
.. py:function:: name()
返回Metric实例的名字, 参考上述的name,默认是'auc'
返回: 评估的名字,string类型。
......@@ -6,71 +6,114 @@ Metric
.. py:class:: paddle.metric.Metric()
Base class for metric, encapsulates metric logic and APIs
Usage:
评估器metric的基类。
用法:
.. code-block:: text
m = SomeMetric()
for prediction, label in ...:
m.update(prediction, label)
m.accumulate()
:code:`compute` 接口的进阶用法:
在 :code:`compute` 中可以使用PaddlePaddle内置的算子进行评估器的状态,而不是通过
Python/NumPy, 这样可以加速计算。:code:`update` 接口将 :code:`compute` 的输出作为
输入,内部采用Python/NumPy计算。
:code: `Metric` 计算流程如下 (在{}中的表示模型和评估器的计算):
.. code-block:: text
inputs & labels || ------------------
| ||
{model} ||
| ||
outputs & labels ||
| || tensor data
{Metric.compute} ||
| ||
metric states(tensor) ||
| ||
{fetch as numpy} || ------------------
| ||
metric states(numpy) || numpy data
| ||
{Metric.update} \/ ------------------
**代码示例**
以 计算正确率的 :code: `Accuracy` 为例,该评估器的输入为 :code: `pred` 和
:code: `label`, 可以在 :code:`compute` 中通过 :code: `pred` 和 :code: `label`
先计算正确预测的矩阵。 例如,预测结果包含10类,:code: `pred` 的shape是[N, 10],
:code: `label` 的shape是[N, 1], N是batch size,我们需要计算top-1和top-5的准
确率,可以在:code: `compute` 中计算每个样本的top-5得分,正确预测的矩阵的shape
是[N, 5].
Advanced usage for :code:`compute`:
Metric calculation can be accelerated by calculating metric states
from model outputs and labels by build-in operators not by Python/NumPy
in :code:`compute`, metric states will be fetched as NumPy array and
call :code:`update` with states in NumPy format.
Metric calculated as follows (operations in Model and Metric are
indicated with curly brackets, while data nodes not):
inputs & labels || ------------------
| ||
{model} ||
| ||
outputs & labels ||
| || tensor data
{Metric.compute} ||
| ||
metric states(tensor) ||
| ||
{fetch as numpy} || ------------------
| ||
metric states(numpy) || numpy data
| ||
{Metric.update} \/ ------------------
代码示例
:::::::::
For :code:`Accuracy` metric, which takes :code:`pred` and :code:`label`
as inputs, we can calculate the correct prediction matrix between
:code:`pred` and :code:`label` in :code:`compute`.
For examples, prediction results contains 10 classes, while :code:`pred`
shape is [N, 10], :code:`label` shape is [N, 1], N is mini-batch size,
and we only need to calculate accurary of top-1 and top-5, we could
calculate the correct prediction matrix of the top-5 scores of the
prediction of each sample like follows, while the correct prediction
matrix shape is [N, 5].
.. code-block:: python
def compute(pred, label):
# sort prediction and slice the top-5 scores
pred = paddle.argsort(pred, descending=True)[:, :5]
# calculate whether the predictions are correct
correct = pred == label
return paddle.cast(correct, dtype='float32')
With the :code:`compute`, we split some calculations to OPs (which
may run on GPU devices, will be faster), and only fetch 1 tensor with
shape as [N, 5] instead of 2 tensors with shapes as [N, 10] and [N, 1].
:code:`update` can be define as follows:
.. code-block:: python
def update(self, correct):
accs = []
for i, k in enumerate(self.topk):
num_corrects = correct[:, :k].sum()
num_samples = len(correct)
accs.append(float(num_corrects) / num_samples)
self.total[i] += num_corrects
self.count[i] += num_samples
return accs
\ No newline at end of file
.. code-block:: python
def compute(pred, label):
# sort prediction and slice the top-5 scores
pred = paddle.argsort(pred, descending=True)[:, :5]
# calculate whether the predictions are correct
correct = pred == label
return paddle.cast(correct, dtype='float32')
在:code:`compute` 中的计算,使用内置的算子(可以跑在GPU上,是的速度更快)。
作为:code:`update` 的输入,该接口计算如下:
.. code-block:: python
def update(self, correct):
accs = []
for i, k in enumerate(self.topk):
num_corrects = correct[:, :k].sum()
num_samples = len(correct)
accs.append(float(num_corrects) / num_samples)
self.total[i] += num_corrects
self.count[i] += num_samples
return accs
.. py:function:: reset()
清空状态和计算结果。
返回:无
.. py:function:: update(*args)
更新状态。如果定义了:code:`compute` ,:code:`update` 的输入是:code:`compute` 的输出。
如果没有定义,则输入是网络的输出**output**和标签**label**,
如: :code:`update(output1, output2, ..., label1, label2,...)` .
也可以参考 :code:`update` 。
.. py:function:: accumulate()
累积的统计指标,计算和返回评估结果。
返回:评估结果,一般是个标量 或 多个标量。
.. py:function:: name()
返回Metric的名字, 一般通过__init__构造函数传入。
返回: 评估的名字,string类型。
.. py:function:: compute()
此接口可以通过PaddlePaddle内置的算子计算metric的状态,可以加速metric的计算,
为可选的高阶接口。
如果这个接口定义了,输入是网络的输出 **outputs** 和 标签 **labels** , 定义如:
:code:`compute(output1, output2, ..., label1, label2,...)` 。
如果这个接口没有定义, 默认的行为是直接将输入参数返回给 :code: `update` ,则其
定义如: :code:`update(output1, output2, ..., label1, label2,...)` 。
也可以参考 :code:`compute` 。
......@@ -6,68 +6,99 @@ Precision
.. py:class:: paddle.metric.Precision()
Precision (also called positive predictive value) is the fraction of
relevant instances among the retrieved instances. Refer to
https://en.wikipedia.org/wiki/Evaluation_of_binary_classifiers
精确率Precision(也称为 positive predictive value,正预测值)是被预测为正样例中实际为正的比例。 https://en.wikipedia.org/wiki/Evaluation_of_binary_classifiers 该类管理二分类任务的precision分数。
Noted that this class manages the precision score only for binary
classification task.
**注意**:这个metric只能用来评估二分类。
参数
参数:
:::::::::
name (str, optional): String name of the metric instance.
Default is `precision`.
- **name** (str,可选) metric实例的名字,默认是'precision'
Example by standalone:
**代码示例**
# 独立使用示例:
.. code-block:: python
import numpy as np
import paddle
x = np.array([0.1, 0.5, 0.6, 0.7])
y = np.array([0, 1, 1, 1])
import numpy as np
import paddle
m = paddle.metric.Precision()
m.update(x, y)
res = m.accumulate()
print(res) # 1.0
x = np.array([0.1, 0.5, 0.6, 0.7])
y = np.array([0, 1, 1, 1])
m = paddle.metric.Precision()
m.update(x, y)
res = m.accumulate()
print(res) # 1.0
Example with Model API:
# Model API中的示例:
.. code-block:: python
import numpy as np
import paddle
import paddle.nn as nn
class Data(paddle.io.Dataset):
def __init__(self):
super(Data, self).__init__()
self.n = 1024
self.x = np.random.randn(self.n, 10).astype('float32')
self.y = np.random.randint(2, size=(self.n, 1)).astype('float32')
def __getitem__(self, idx):
return self.x[idx], self.y[idx]
def __len__(self):
return self.n
import numpy as np
import paddle
import paddle.nn as nn
class Data(paddle.io.Dataset):
def __init__(self):
super(Data, self).__init__()
self.n = 1024
self.x = np.random.randn(self.n, 10).astype('float32')
self.y = np.random.randint(2, size=(self.n, 1)).astype('float32')
def __getitem__(self, idx):
return self.x[idx], self.y[idx]
def __len__(self):
return self.n
paddle.disable_static()
model = paddle.Model(nn.Sequential(
nn.Linear(10, 1),
nn.Sigmoid()
))
optim = paddle.optimizer.Adam(
learning_rate=0.001, parameters=model.parameters())
model.prepare(
optim,
loss=nn.BCELoss(),
metrics=paddle.metric.Precision())
data = Data()
model.fit(data, batch_size=16)
\ No newline at end of file
paddle.disable_static()
model = paddle.Model(nn.Sequential(
nn.Linear(10, 1),
nn.Sigmoid()
))
optim = paddle.optimizer.Adam(
learning_rate=0.001, parameters=model.parameters())
model.prepare(
optim,
loss=nn.BCELoss(),
metrics=paddle.metric.Precision())
data = Data()
model.fit(data, batch_size=16)
.. py:function:: update(preds, labels, *args)
更新Precision的状态。
参数:
:::::::::
- **preds** (numpy.array | Tensor): 预测输出结果通常是sigmoid函数的输出,是一个数据类型为float64float32的向量。
- **labels** (numpy.array | Tensor): 真实标签的shape:code: `preds` 相同,数据类型为int32int64
返回: 无。
.. py:function:: reset()
清空状态和计算结果。
返回:无
.. py:function:: accumulate()
累积的统计指标,计算和返回precision值。
返回:precision值,一个标量。
.. py:function:: name()
返回Metric实例的名字, 参考上述的name,默认是'precision'
返回: 评估的名字,string类型。
......@@ -6,71 +6,99 @@ Recall
.. py:class:: paddle.metric.Recall()
Recall (also known as sensitivity) is the fraction of
relevant instances that have been retrieved over the
total amount of relevant instances
召回率Recall(也称为敏感度)是指得到的相关实例数占相关实例总数的比例。https://en.wikipedia.org/wiki/Precision_and_recall 该类管理二分类任务的召回率。
Refer to:
https://en.wikipedia.org/wiki/Precision_and_recall
**注意**:这个metric只能用来评估二分类。
Noted that this class manages the recall score only for
binary classification task.
参数
参数
:::::::::
name (str, optional): String name of the metric instance.
Default is `recall`.
- **name** (str,可选) metric实例的名字,默认是'recall'
Example by standalone:
**代码示例**
# 独立使用示例:
.. code-block:: python
import numpy as np
import paddle
import numpy as np
import paddle
x = np.array([0.1, 0.5, 0.6, 0.7])
y = np.array([1, 0, 1, 1])
x = np.array([0.1, 0.5, 0.6, 0.7])
y = np.array([1, 0, 1, 1])
m = paddle.metric.Recall()
m.update(x, y)
res = m.accumulate()
print(res) # 2.0 / 3.0
m = paddle.metric.Recall()
m.update(x, y)
res = m.accumulate()
print(res) # 2.0 / 3.0
Example with Model API:
# Model API中的示例:
.. code-block:: python
import numpy as np
import paddle
import paddle.nn as nn
class Data(paddle.io.Dataset):
def __init__(self):
super(Data, self).__init__()
self.n = 1024
self.x = np.random.randn(self.n, 10).astype('float32')
self.y = np.random.randint(2, size=(self.n, 1)).astype('float32')
def __getitem__(self, idx):
return self.x[idx], self.y[idx]
def __len__(self):
return self.n
paddle.disable_static()
model = paddle.Model(nn.Sequential(
nn.Linear(10, 1),
nn.Sigmoid()
))
optim = paddle.optimizer.Adam(
learning_rate=0.001, parameters=model.parameters())
model.prepare(
optim,
loss=nn.BCELoss(),
metrics=[paddle.metric.Precision(), paddle.metric.Recall()])
data = Data()
model.fit(data, batch_size=16)
\ No newline at end of file
import numpy as np
import paddle
import paddle.nn as nn
class Data(paddle.io.Dataset):
def __init__(self):
super(Data, self).__init__()
self.n = 1024
self.x = np.random.randn(self.n, 10).astype('float32')
self.y = np.random.randint(2, size=(self.n, 1)).astype('float32')
def __getitem__(self, idx):
return self.x[idx], self.y[idx]
def __len__(self):
return self.n
paddle.disable_static()
model = paddle.Model(nn.Sequential(
nn.Linear(10, 1),
nn.Sigmoid()
))
optim = paddle.optimizer.Adam(
learning_rate=0.001, parameters=model.parameters())
model.prepare(
optim,
loss=nn.BCELoss(),
metrics=[paddle.metric.Precision(), paddle.metric.Recall()])
data = Data()
model.fit(data, batch_size=16)
.. py:function:: update(preds, labels, *args)
更新Recall的状态。
参数:
:::::::::
- **preds** (numpy.array | Tensor): 预测输出结果通常是sigmoid函数的输出,是一个数据类型为float64float32的向量。
- **labels** (numpy.array | Tensor): 真实标签的shape:code: `preds` 相同,数据类型为int32int64
返回: 无。
.. py:function:: reset()
清空状态和计算结果。
返回:无
.. py:function:: accumulate()
累积的统计指标,计算和返回recall值。
返回:precision值,一个标量。
.. py:function:: name()
返回Metric实例的名字, 参考上述的name,默认是'recall'
返回: 评估的名字,string类型。
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