# Label Validation
Ango Hub allows you to implement and manage validation scripts that apply across all project stages. These scripts offer flexibility through continuous editability as your project requirements change.
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Post-publication edits to the validation script will take affect to batches where the user will explicitly trigger the ‘Validation' feature again on the tool.
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## **Types of Validation Scripts**
Validation scripts are executed using a decorator-based approach. Each type of validation uses specific decorators to target different elements like frames, classes, or task attributes.
### **1. Frame-wise Validation**
Frame-wise validation ensures that each individual frame is validated according to specific rules. A decorator for this type of validation specifies that the function will process one frame at a time.
#### **Decorator Usage:**
* The decorator `@dec({"type": "frame"})` tells the system that the function is working on individual frame data.
#### **Function Definition:**
* The function receives one parameter, which is the data for a specific frame.
* The function processes this frame and can return an error log if any issue is found.
### **2. Class Validation Across Multiple Frames**
Class validation checks specific classes across multiple frames. This ensures that particular classes (e.g., "Vehicle", "Trucks", etc.) are consistently annotated across all frames.
#### **Decorator Usage:**
* The decorator `@dec({"type": "object", "selector": "class", "value": ["", ""]})` tells the system to pass annotations of the specified classes across all frames into the function.
#### **Function Definition:**
* The function receives one parameter for each specified class. If you validate two classes, you need two parameters.
* The function compares or processes the classes across multiple frames.
**3. Task-wise Attribute Validation Across Frames**
This type of validation ensures that attributes related to a task are validated across all frames in the task.
#### **Decorator Usage:**
* The decorator `@dec({"type": "attribute", "selector": "task"})` indicates that the function will work with task-level attributes across multiple frames.
#### **Function Definition:**
* The function receives one parameter that includes all attributes related to the task, across all frames.
## Validations on the 3D MSF Tool
The **Interactive Validation** performs real-time checks on annotations before the data moves to the next stage in the taskflow. It uses pre-defined validations setup and highlights potential issues. The tool allows users to view, validate, and fix problems interactively without leaving the annotation workspace.
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Validation enhances the workflow by ensuring consistent and high-quality results across sequences.
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