Life Cycle of a Deep Learning Computer Vision Project
The life cycle of a deep learning computer vision project involves multiple stages, from defining the problem to deploying and monitoring the model in production. Below is a detailed explanation of each stage:
1. Problem Definition
- Objective: Clearly define the problem you aim to solve (e.g., object detection, image classification, segmentation).
- Key Questions:
- What is the problem (e.g., detecting vehicles in traffic)?
- Why is it important?
- What is the expected outcome?
- Deliverable: A well-defined project scope and success criteria.
2. Data Collection
- Objective: Gather relevant data to train your model.
- Steps:
- Collect images/videos from cameras, online datasets, APIs, or simulations.
- Label the data manually or using automated tools (e.g., bounding boxes, segmentation masks).
- Tools: LabelImg, LabelMe, CVAT, or custom scripts.
- Deliverable: A labeled dataset, usually split into training, validation, and test sets.
3. Data Preprocessing
- Objective: Prepare the data for model training.
- Steps:
- Resize images to a fixed dimension.
- Normalize pixel values (e.g., scale them to [0, 1] or [-1, 1]).
- Augment data (e.g., rotations, flips, color shifts) to increase robustness.
- Handle class imbalance (e.g., oversampling, undersampling).
- Deliverable: A clean, standardized dataset ready for training.
4. Model Selection
- Objective: Choose a suitable architecture for the task.
- Options:
- Image Classification: ResNet, EfficientNet, MobileNet.
- Object Detection: YOLO, Faster R-CNN, SSD.
- Segmentation: U-Net, DeepLab, Mask R-CNN.
- Considerations:
- Accuracy vs. inference speed.
- Hardware constraints (e.g., edge devices).
- Deliverable: Selected model architecture.
5. Model Training
- Objective: Train the deep learning model on the dataset.
- Steps:
- Load data and define the model architecture.
- Specify a loss function (e.g., Cross-Entropy, IoU loss) and optimizer (e.g., Adam, SGD).
- Train the model using the training dataset.
- Monitor metrics like loss, accuracy, precision, recall, and mAP during training.
- Use techniques like learning rate scheduling, early stopping, or checkpointing.
- Deliverable: A trained model (e.g., best.pt, model.pth).
6. Model Evaluation
- Objective: Evaluate the model on the validation and test datasets.
- Metrics:
- Classification: Accuracy, F1-score, Precision, Recall.
- Detection: mAP (mean Average Precision), IoU (Intersection over Union).
- Segmentation: Dice Coefficient, IoU.
- Tools: Matplotlib, TensorBoard, or built-in library visualizations.
- Deliverable: Performance report, confusion matrix, and identified shortcomings.
7. Model Optimization
- Objective: Improve model performance and efficiency.
- Techniques:
- Hyperparameter tuning (e.g., learning rate, batch size, number of layers).
- Fine-tuning with pre-trained models (e.g., Transfer Learning).
- Model pruning, quantization, or knowledge distillation for deployment on resource-constrained devices.
- Deliverable: Optimized model ready for deployment.
8. Model Deployment
- Objective: Integrate the trained model into an application.
- Options:
- Deploy as a web service using Flask, FastAPI, or TensorFlow Serving.
- Deploy on-edge devices using ONNX, TensorFlow Lite, or NVIDIA TensorRT.
- Steps:
- Convert the model to the required format (e.g., .onnx, .tflite).
- Set up inference pipelines.
- Ensure latency and throughput meet requirements.
- Deliverable: A functional, integrated model.
9. Monitoring and Maintenance
- Objective: Monitor the deployed model and maintain performance over time.
- Steps:
- Track inference metrics like latency, accuracy, and failures.
- Log edge cases and identify data drift.
- Periodically retrain the model with updated data.
- Tools: Prometheus, Grafana, or custom monitoring dashboards.
- Deliverable: Continuous model updates and performance tracking.
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