Single predictions with per-category models

Single predictions with per-category models | BigML.com

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Created	Thu, 8 Oct 2026 14:59:51 +0000
Published	Thu, 8 Oct 2026 17:26:28 +0000

Description:

Perform a single prediction using category models

Tags:

BigMLer BigMLer_ThuOct0826_165950 category models

URL:

https://bigml.com/user/whizzml/gallery/script/6ac7afe79639eabb37d7526e

Script FREE

Source code

;; Extracts the result of the given execution, signaling an
;; error if it's not of the expected kind.
(define (exec-result eid)
  (let (res ((fetch eid) ["execution" "result"] {})
        ks (if (res "binary" false)
             ["category"]
             ["categories" "missings-model"]))
    (for (k (concat ["models" "field-id" "field-name" "kind"] ks))
      (when (not (contains? res k))
        (raise (str "Invalid execution: Missing field " k " in result"))))
    res))

;; Find the model to use from execution result
(define (find-model cat res)
  (if (res "binary")
    (let ([m nm] (res "models"))
      (if (= cat (res "category")) m nm))
    (let (models (make-map (cons "" (res "categories"))
                           (cons (res "missings-model") (res "models"))))
      (models cat false))))

;; Final workflow
(define (predict-by-category eid input)
  (let (res (exec-result eid)
        cat (or (input (res "field-id") false) (input (res "field-name") ""))
        model (or (find-model cat res)
                  (raise (if (empty? cat)
                             (str "No model for category " cat)
                             "No model for missing category"))))
    (log-info "Creating prediction for "
              (if (empty? cat) "missing category" (str "'" cat "'"))
              " using " model)
    (create-and-wait-prediction {"model" model "input_data" input})))

(define prediction (predict-by-category execution input))

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License: Creative Commons Zero V1.0
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Single predictions with per-category models | BigML.com

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