"loss function" meaning in English

{
  "forms": [
    {
      "form": "loss functions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "loss function (plural loss functions)",
      "name": "en-noun"
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Mathematics",
          "orig": "en:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A function which expresses numerically the loss produced by a decision or other event."
      ],
      "hypernyms": [
        {
          "word": "function"
        }
      ],
      "id": "en-loss_function-en-noun-V5zdjmue",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "decision",
          "decision"
        ],
        [
          "event",
          "event"
        ]
      ],
      "raw_glosses": [
        "(mathematics) A function which expresses numerically the loss produced by a decision or other event."
      ],
      "synonyms": [
        {
          "word": "cost function"
        }
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "sense": "function which expresses numerically the loss produced by a decision or other event",
          "word": "損失函數 /损失函数"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "function which expresses numerically the loss produced by a decision or other event",
          "tags": [
            "common-gender"
          ],
          "word": "förlustfunktion"
        }
      ]
    }
  ],
  "word": "loss function"
}

{
  "forms": [
    {
      "form": "loss functions",
      "tags": [
        "plural"
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      "expansion": "loss function (plural loss functions)",
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      "word": "function"
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "A function which expresses numerically the loss produced by a decision or other event."
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "decision",
          "decision"
        ],
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      ],
      "raw_glosses": [
        "(mathematics) A function which expresses numerically the loss produced by a decision or other event."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "cost function"
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "sense": "function which expresses numerically the loss produced by a decision or other event",
      "word": "損失函數 /损失函数"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "function which expresses numerically the loss produced by a decision or other event",
      "tags": [
        "common-gender"
      ],
      "word": "förlustfunktion"
    }
  ],
  "word": "loss function"
}