SampleAugmentation

从样本数据文件生成合成样本。

描述

该应用程序采用由 SampleExtraction 应用程序，并生成合成样本以增加可用样本的数量。

参数

Input samples -in vectorfile Mandatory
Vector data file containing samples (OGR format)

Output samples -out filename [dtype] Mandatory
Output vector data file storing new samples(OGR format).

Field Name -field string
Name of the field carrying the class name in the input vectors.

Layer Index -layer int Default value: 0
Layer index to read in the input vector file.

Label of the class to be augmented -label int Default value: 1
Label of the class of the input file for which new samples will be generated.

Number of generated samples -samples int Default value: 100
Number of synthetic samples that will be generated.

Field names for excluded features -exclude string1 string2...
List of field names in the input vector data that will not be generated in the output file.

Augmentation strategy -strategy [replicate|jitter|smote] Default value: replicate

  • Replicate input samples
    The new samples are generated by replicating input samples which are randomly selected with replacement.
  • Jitter input samples
    The new samples are generated by adding gaussian noise to input samples which are randomly selected with replacement.
  • Smote input samples
    The new samples are generated by using the SMOTE algorithm (http://dx.doi.org/10.1613/jair.953) on input samples which are randomly selected with replacement.

抖动输入采样选项

Factor for dividing the standard deviation of each feature -strategy.jitter.stdfactor float Default value: 10
The noise added to the input samples will have the standard deviation of the input features divided by the value of this parameter.

Smote输入采样选项

Number of nearest neighbors -strategy.smote.neighbors int Default value: 5
Number of nearest neighbors to be used in the SMOTE algorithm

Random seed -seed int
Set a specific random seed with integer value.

实例

从命令行执行以下操作：

otbcli_SampleAugmentation -in samples.sqlite -field class -label 3 -samples 100 -out augmented_samples.sqlite -exclude OGC_FID name class originfid -strategy smote -strategy.smote.neighbors 5

来自Python的评论：

import otbApplication

app = otbApplication.Registry.CreateApplication("SampleAugmentation")

app.SetParameterString("in", "samples.sqlite")
app.SetParameterString("field", "class")
app.SetParameterInt("label", 3)
app.SetParameterInt("samples", 100)
app.SetParameterString("out", "augmented_samples.sqlite")
app.SetParameterStringList("exclude", ['OGC_FID', 'name', 'class', 'originfid'])
app.SetParameterString("strategy","smote")
app.SetParameterInt("strategy.smote.neighbors", 5)

app.ExecuteAndWriteOutput()