"no free lunch theorem" meaning in English

{
  "etymology_text": "Derives from the phrase there's no such thing as a free lunch.",
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
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          "kind": "other",
          "name": "English entries with incorrect language header",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Artificial intelligence",
          "orig": "en:Artificial intelligence",
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            "Computer science",
            "Cybernetics",
            "Computing",
            "Sciences",
            "Applied mathematics",
            "Systems theory",
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            "Mathematics",
            "Systems",
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          "langcode": "en",
          "name": "Computing",
          "orig": "en:Computing",
          "parents": [
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A theorem that implies that no single machine learning algorithm is universally the best-performing algorithm for all problems."
      ],
      "id": "en-no_free_lunch_theorem-en-name-7Eb9uWnk",
      "links": [
        [
          "artificial intelligence",
          "artificial intelligence"
        ],
        [
          "computing",
          "computing#Noun"
        ],
        [
          "theorem",
          "theorem"
        ],
        [
          "implies",
          "implies"
        ],
        [
          "machine learning",
          "machine learning"
        ],
        [
          "algorithm",
          "algorithm"
        ],
        [
          "universally",
          "universally"
        ],
        [
          "best",
          "best"
        ],
        [
          "performing",
          "performing"
        ]
      ],
      "qualifier": "artificial intelligence",
      "raw_glosses": [
        "(artificial intelligence, computing) A theorem that implies that no single machine learning algorithm is universally the best-performing algorithm for all problems."
      ],
      "topics": [
        "computing",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences"
      ]
    }
  ],
  "word": "no free lunch theorem"
}

{
  "etymology_text": "Derives from the phrase there's no such thing as a free lunch.",
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      "expansion": "no free lunch theorem",
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
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        "English multiword terms",
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        "English uncountable nouns",
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        "en:Artificial intelligence",
        "en:Computing"
      ],
      "glosses": [
        "A theorem that implies that no single machine learning algorithm is universally the best-performing algorithm for all problems."
      ],
      "links": [
        [
          "artificial intelligence",
          "artificial intelligence"
        ],
        [
          "computing",
          "computing#Noun"
        ],
        [
          "theorem",
          "theorem"
        ],
        [
          "implies",
          "implies"
        ],
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          "machine learning",
          "machine learning"
        ],
        [
          "algorithm",
          "algorithm"
        ],
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          "universally",
          "universally"
        ],
        [
          "best",
          "best"
        ],
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          "performing",
          "performing"
        ]
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      "qualifier": "artificial intelligence",
      "raw_glosses": [
        "(artificial intelligence, computing) A theorem that implies that no single machine learning algorithm is universally the best-performing algorithm for all problems."
      ],
      "topics": [
        "computing",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences"
      ]
    }
  ],
  "word": "no free lunch theorem"
}