Text Classification¶
Model training requires a large amount of labeled data. Therefore, before the model training, add labels to the files that are not labeled. In addition, you can modify, delete, and re-label the labeled text.
Text classification classifies text content based on labels. Before labeling text content, you need to understand the following:
Text labeling supports multiple labels. That is, you can add multiple labels to a labeling object.
A label name can contain a maximum of 32 characters, including letters, digits, hyphens (-), and underscores (_).
Starting Labeling¶
Log in to the ModelArts console. In the navigation pane, choose Data Management > Datasets. The Datasets page is displayed.
In the dataset list, select the dataset to be labeled based on the labeling type, and click the dataset name to go to the Dashboard tab page of the dataset.
By default, the Dashboard tab page of the current dataset version is displayed. If you need to label the dataset of another version, click the Versions tab and then click Set to Current Version in the right pane. For details, see Managing Dataset Versions.
On the Dashboard page of the dataset, click Label in the upper right corner. The dataset details page is displayed. By default, all data of the dataset is displayed on the dataset details page.
Labeling Content¶
The dataset details page displays the labeled and unlabeled text files in the dataset. The Unlabeled tab page is displayed by default.
On the Unlabeled tab page, the objects to be labeled are listed in the left pane. In the list, click the text object to be labeled, and select a label in the Label Set area in the right pane. Multiple labels can be added to a labeling object.
You can repeat this operation to select objects and add labels to the objects.
Figure 1 Labeling for text classification¶
After all objects are labeled, click Save Current Page at the bottom of the page to complete labeling text files on the Unlabeled tab page.
Adding Labels¶
Adding labels on the Unlabeled tab page: Click the plus sign (+) next to Label Set. On the Add Label page that is displayed, add a label name, select a label color, and click OK.
Figure 2 Adding Labels¶
Adding labels on the Labeled tab page: Click the plus sign (+) next to All Labels. On the Add Label page that is displayed, add a label name, select a label color, and click OK.
Figure 3 Adding a label¶
Viewing the Labeled Text¶
On the dataset details page, click the Labeled tab to view the list of the labeled text. You can also view all labels supported by the dataset in the All Labels area on the right.
Modifying Labeled Data¶
After labeling data, you can modify labeled data on the Labeled tab page.
Modifying based on texts
On the dataset details page, click the Labeled tab, and select the text to be modified from the text list.
In the text list, click the text. When the text background turns blue, the text is selected. If a text file has multiple labels, you can click
above a label to delete the label.Modifying based on labels
On the dataset details page, click the Labeled tab. The information about all labels is displayed on the right.
Batch modification: In the All Labels area, click the editing icon in the Operation column, modify the label name in the text box, select a label color, and click OK.
Batch deletion: In the All Labels area, click the deletion icon in the Operation column to delete the label. In the dialog box that is displayed, select Delete label or Delete label and objects with only the label, and click OK.
Adding Files¶
In addition to automatically synchronizing data from Input Dataset Path, you can directly add text files on ModelArts for data labeling.
On the dataset details page, click the Unlabeled tab. Then click Add File.
In the displayed Add File dialog box, set the parameters as required and then select the file to be uploaded.
Select one or more files to be uploaded in the local environment. Only .txt and .csv files are supported. The total size of files uploaded at a time cannot exceed 8 MB. Text and Label Separator and Label Separator must be different.
Pattern: Select Merge text objects and labels or Separate text objects and labels. An example is provided. Determine the mode of the file to be added by referring to the example.
Text and Label Separator: Select Tab, Space, Semicolon, Comma, or Other. If you select Other, enter a separator in the text box on the right.
Label Separator: Select Tab, Space, Semicolon, Comma, or Other. If you select Other, enter a separator in the text box on the right.
Figure 4 Adding a file¶
In the Add File dialog box, click Upload. The files you add will be automatically displayed on the Unlabeled or Labeled tab page.
Deleting a File¶
You can quickly delete the files you want to discard.
On the Unlabeled tab page, select the text to be deleted, and click Delete in the upper left corner to delete the text.
On the Labeled tab page, select the text to be deleted and click Delete. Alternatively, you can tick Select Images on Current Page to select all text objects on the current page and click Delete in the upper left corner.
The background of the selected text is blue.