Expression¶
Class: ExpressionBlockV1
Source: inference.core.workflows.core_steps.formatters.expression.v1.ExpressionBlockV1
Creates specific output based on defined input variables and configured rules - which is useful while creating business logic in workflows.
Based on configuration, block takes input data, optionally performs operation on data, save it as variables and evaluate switch-case like statements to get the final result.
Type identifier¶
Use the following identifier in step "type" field: roboflow_core/expression@v1to add the block as
as step in your workflow.
Properties¶
| Name | Type | Description | Refs |
|---|---|---|---|
name |
str |
Enter a unique identifier for this step.. | ❌ |
data_operations |
Dict[str, List[Union[ClassificationPropertyExtract, ConvertDictionaryToJSON, ConvertImageToBase64, ConvertImageToJPEG, DetectionsFilter, DetectionsOffset, DetectionsPropertyExtract, DetectionsRename, DetectionsSelection, DetectionsShift, DetectionsToDictionary, Divide, ExtractDetectionProperty, ExtractImageProperty, LookupTable, Multiply, NumberRound, NumericSequenceAggregate, PickDetectionsByParentClass, RandomNumber, SequenceAggregate, SequenceApply, SequenceElementsCount, SequenceLength, SequenceMap, SortDetections, StringMatches, StringSubSequence, StringToLowerCase, StringToUpperCase, ToBoolean, ToNumber, ToString]]] |
UQL definitions of operations to be performed on defined data before switch-case instruction. | ❌ |
switch |
CasesDefinition |
Define the logic to be executed.. | ❌ |
The Refs column marks possibility to parametrise the property with dynamic values available
in workflow runtime. See Bindings for more info.
Available Connections¶
Compatible Blocks
Check what blocks you can connect to Expression in version v1.
- inputs:
Corner Visualization,Slack Notification,VLM as Detector,VLM as Classifier,Polygon Zone Visualization,Image Slicer,Cache Set,Dot Visualization,Path Deviation,Roboflow Dataset Upload,Single-Label Classification Model,Image Convert Grayscale,Dominant Color,Stability AI Image Generation,Halo Visualization,Data Aggregator,Detections Classes Replacement,Dynamic Zone,CogVLM,Camera Calibration,Email Notification,Object Detection Model,Cosine Similarity,Single-Label Classification Model,Llama 3.2 Vision,Byte Tracker,Ellipse Visualization,Pixel Color Count,Size Measurement,Bounding Box Visualization,Line Counter Visualization,Image Preprocessing,Label Visualization,Local File Sink,Image Slicer,Detections Transformation,Anthropic Claude,Crop Visualization,Detections Stitch,OCR Model,Relative Static Crop,Model Comparison Visualization,QR Code Detection,Delta Filter,Path Deviation,Detections Filter,Clip Comparison,Time in Zone,CSV Formatter,Florence-2 Model,Keypoint Detection Model,Buffer,SIFT Comparison,Florence-2 Model,Multi-Label Classification Model,Rate Limiter,Keypoint Visualization,Identify Changes,Multi-Label Classification Model,Roboflow Custom Metadata,Line Counter,Stitch Images,Circle Visualization,Background Color Visualization,Twilio SMS Notification,Property Definition,LMM,Camera Focus,Image Blur,First Non Empty Or Default,Detections Merge,Google Gemini,Detection Offset,Stability AI Inpainting,Pixelate Visualization,Line Counter,OpenAI,Detections Consensus,Distance Measurement,Gaze Detection,Absolute Static Crop,Webhook Sink,Color Visualization,Image Threshold,Polygon Visualization,VLM as Classifier,Continue If,Instance Segmentation Model,Environment Secrets Store,Classification Label Visualization,Google Vision OCR,Roboflow Dataset Upload,Expression,Cache Get,JSON Parser,Object Detection Model,Keypoint Detection Model,Trace Visualization,Clip Comparison,Identify Outliers,YOLO-World Model,Stitch OCR Detections,Perspective Correction,Byte Tracker,OpenAI,Qwen2.5-VL,Mask Visualization,Time in Zone,Dynamic Crop,Template Matching,Barcode Detection,Byte Tracker,Instance Segmentation Model,Image Contours,SIFT,Reference Path Visualization,CLIP Embedding Model,Model Monitoring Inference Aggregator,Bounding Rectangle,Triangle Visualization,Velocity,SIFT Comparison,VLM as Detector,LMM For Classification,Grid Visualization,Segment Anything 2 Model,Detections Stabilizer,Dimension Collapse,Blur Visualization - outputs:
Corner Visualization,Slack Notification,VLM as Detector,VLM as Classifier,Polygon Zone Visualization,Image Slicer,Cache Set,Path Deviation,Dot Visualization,Roboflow Dataset Upload,Single-Label Classification Model,Dominant Color,Stability AI Image Generation,Image Convert Grayscale,Halo Visualization,Data Aggregator,Detections Classes Replacement,Dynamic Zone,CogVLM,Email Notification,Camera Calibration,Object Detection Model,Cosine Similarity,Single-Label Classification Model,Llama 3.2 Vision,Byte Tracker,Ellipse Visualization,Pixel Color Count,Size Measurement,Bounding Box Visualization,Line Counter Visualization,Image Preprocessing,Label Visualization,Local File Sink,Image Slicer,Detections Transformation,Anthropic Claude,Crop Visualization,Detections Stitch,OCR Model,Model Comparison Visualization,Relative Static Crop,QR Code Detection,Delta Filter,Path Deviation,Detections Filter,Clip Comparison,Time in Zone,CSV Formatter,Florence-2 Model,Keypoint Detection Model,Buffer,SIFT Comparison,Florence-2 Model,Multi-Label Classification Model,Rate Limiter,Keypoint Visualization,Identify Changes,Multi-Label Classification Model,Roboflow Custom Metadata,Line Counter,Stitch Images,Circle Visualization,Background Color Visualization,Twilio SMS Notification,Property Definition,LMM,Camera Focus,Image Blur,First Non Empty Or Default,Detections Merge,Google Gemini,Detection Offset,Stability AI Inpainting,Pixelate Visualization,Line Counter,OpenAI,Detections Consensus,Gaze Detection,Distance Measurement,Absolute Static Crop,Webhook Sink,Color Visualization,Image Threshold,Polygon Visualization,VLM as Classifier,Continue If,Instance Segmentation Model,Classification Label Visualization,Google Vision OCR,Roboflow Dataset Upload,Expression,Cache Get,JSON Parser,Object Detection Model,Keypoint Detection Model,Trace Visualization,Clip Comparison,Identify Outliers,YOLO-World Model,Stitch OCR Detections,Perspective Correction,OpenAI,Byte Tracker,Qwen2.5-VL,Mask Visualization,Time in Zone,Dynamic Crop,Template Matching,Byte Tracker,Barcode Detection,Instance Segmentation Model,Image Contours,SIFT,Reference Path Visualization,CLIP Embedding Model,Triangle Visualization,Model Monitoring Inference Aggregator,Bounding Rectangle,Velocity,SIFT Comparison,VLM as Detector,LMM For Classification,Grid Visualization,Segment Anything 2 Model,Detections Stabilizer,Dimension Collapse,Blur Visualization
Input and Output Bindings¶
The available connections depend on its binding kinds. Check what binding kinds
Expression in version v1 has.
Bindings
Example JSON definition of step Expression in version v1
{
"name": "<your_step_name_here>",
"type": "roboflow_core/expression@v1",
"data": {
"predictions": "$steps.model.predictions",
"reference": "$inputs.reference_class_names"
},
"data_operations": {
"predictions": [
{
"property_name": "class_name",
"type": "DetectionsPropertyExtract"
}
]
},
"switch": {
"cases": [
{
"condition": {
"statements": [
{
"comparator": {
"type": "=="
},
"left_operand": {
"operand_name": "class_name",
"type": "DynamicOperand"
},
"right_operand": {
"operand_name": "reference",
"type": "DynamicOperand"
},
"type": "BinaryStatement"
}
],
"type": "StatementGroup"
},
"result": {
"type": "StaticCaseResult",
"value": "PASS"
},
"type": "CaseDefinition"
}
],
"default": {
"type": "StaticCaseResult",
"value": "FAIL"
},
"type": "CasesDefinition"
}
}