https://taimaka.org/blog daily 0.75 2026-03-13 https://taimaka.org/blog/patient-identification-system monthly 0.5 2026-03-13 https://images.squarespace-cdn.com/content/v1/5d3e07692e027a00013be3f4/36ff48c0-b684-4ce6-aa3a-64fbe0c1bf3f/facial_recognition_system.png Blog - Taimaka ID: Building a patient identification system for pediatric malnutrition treatment in Nigeria - Make it stand out An example of a facial recognition system. The landmarking model identifies locations of important facial features like eyes, nose, mouth, etc. Using these landmarks, the image is transformed and cropped and then passed to the embedding model, which creates the embedding vector for each image. Finally, the two embeddings are compared. https://images.squarespace-cdn.com/content/v1/5d3e07692e027a00013be3f4/3cb0b322-1caf-4eab-a65a-87149428fbe1/embedding_similarity_histogram.png Blog - Taimaka ID: Building a patient identification system for pediatric malnutrition treatment in Nigeria - Make it stand out Similarity scores based on embeddings created by FaceNet. The orange histogram represents the distribution of similarity scores computed on two photos of different patients, and the blue histogram represents the distribution of similarity scores of two different photos of the same patient. There is significant overlap of these two distributions which implies that false rejection and acceptance rates would be too high to be useful. https://images.squarespace-cdn.com/content/v1/5d3e07692e027a00013be3f4/0ce11169-0540-4187-a173-efb668c4556c/model_architecture.png Blog - Taimaka ID: Building a patient identification system for pediatric malnutrition treatment in Nigeria - Make it stand out An illustration of the architecture of our FaceNet model. The image of a patient’s face first passes through the base FaceNet architecture which outputs a 512-dimensional embedding. That embedding then passes through a custom head consisting of two layers. The final output is a 128-dimensional embedding. (This diagram is for illustration only; the actual number of FaceNet layers is much larger.) https://images.squarespace-cdn.com/content/v1/5d3e07692e027a00013be3f4/e6267824-4a87-4dd4-bd94-46cebd0981b3/embedding_training_visualization.gif Blog - Taimaka ID: Building a patient identification system for pediatric malnutrition treatment in Nigeria - Make it stand out A visualization of face embeddings in three dimensions. Vectors that end in a dot are embeddings of a single photo, and vectors that end in a diamond are the average embedding of all photos for a given patient. As model training progresses, embeddings of different patients are pushed further apart. Note that the actual embeddings used in our system lie on a 128-dimensional hypersphere, rather than the 3-dimensional sphere used for this visualization. https://images.squarespace-cdn.com/content/v1/5d3e07692e027a00013be3f4/07ca8911-d5ec-4d11-9012-aa5b7bf9cac1/cosine_margin_triplet_loss.png Blog - Taimaka ID: Building a patient identification system for pediatric malnutrition treatment in Nigeria - Make it stand out The formula for the cosine-margin-triplet loss. θ+ is the angle between the anchor and comparison embedding, and θ- is the angle between the anchor and negative embedding. The hyperparameters s and m are the radius and margin, respectively. https://images.squarespace-cdn.com/content/v1/5d3e07692e027a00013be3f4/5d0f0392-a148-4d5a-a3ac-492e49d74e64/cosine_margin_triplet_loss_rewritten.png Blog - Taimaka ID: Building a patient identification system for pediatric malnutrition treatment in Nigeria - Make it stand out The original formula is rewritten here in order to help the reader understand how it works. https://images.squarespace-cdn.com/content/v1/5d3e07692e027a00013be3f4/cbb580b7-0acb-40dd-bc8d-1dde59cde341/validation_loss_traceplot.png Blog - Taimaka ID: Building a patient identification system for pediatric malnutrition treatment in Nigeria - Make it stand out Cosine-margin-triplet loss on the validation dataset over each phase of training. The epoch with the best loss is marked with a vertical dashed line for each phase. https://images.squarespace-cdn.com/content/v1/5d3e07692e027a00013be3f4/58e24c6b-1059-4a71-aa57-5b1cc4b6637d/adapted_embedding_similarity_histogram.png Blog - Taimaka ID: Building a patient identification system for pediatric malnutrition treatment in Nigeria - Make it stand out Similarity scores based on embeddings created by our new version of FaceNet that has been trained on Taimaka patient photos. There is now considerably more separation between the two distributions. https://images.squarespace-cdn.com/content/v1/5d3e07692e027a00013be3f4/a4da1279-dc56-43b0-96ab-5bb330eb1186/aggregated_embedding_similarity_histogram.png Blog - Taimaka ID: Building a patient identification system for pediatric malnutrition treatment in Nigeria - Make it stand out Similarity scores based on averaged embeddings. The separation has further improved. https://images.squarespace-cdn.com/content/v1/5d3e07692e027a00013be3f4/c1fc25a6-9392-458b-afae-5d529733aff3/embedding_aggregation_performance_analysis.png Blog - Taimaka ID: Building a patient identification system for pediatric malnutrition treatment in Nigeria - Make it stand out Performance as a function of the recency weight w. The solid lines are the metrics for EWMA templates, and the dashed lines are the metrics for a simple average template, provided for comparison. The blue, orange, and green lines are true rejection rate (TRR), true acceptance rate (TAR), and top 3 accuracy, respectively. While a recency weight of around 0.4 is optimal, it is not better than a simple average template. https://images.squarespace-cdn.com/content/v1/5d3e07692e027a00013be3f4/64c55e3b-297b-4165-96cf-4c41985eaa65/embedding_similarity_performance_over_time.png Blog - Taimaka ID: Building a patient identification system for pediatric malnutrition treatment in Nigeria - Make it stand out Facial similarity scores for 709 photos of 102 patients. The cluster of points on the left are the photos from the original visits, and the cluster on the right are the photos from the checkback survey. A trend line and 95% prediction band are shown, and the horizontal dashed line is the cutoff used for matching. https://images.squarespace-cdn.com/content/v1/5d3e07692e027a00013be3f4/e6594acf-e66f-421e-997d-d27f55509271/acceptance_rate_performance_over_time.png Blog - Taimaka ID: Building a patient identification system for pediatric malnutrition treatment in Nigeria - Make it stand out True acceptance rate of returning patients as a function of time. The true acceptance rate is calculated from the fitted trend in the previous figure using the proportion of the estimated distribution that lies above the matching cutoff of 0.8. 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