Diagnose and resolve field scores > 1

[jamesdunham]

@jmelot noticed that we observe some paper-field scores >> 1, which is unexpected. Field scores should be in [0, 1]. They're the average of available fasttext, tf-idf, and entity scores, where:

• FastText scores are from a MatrixSimilarity lookup,
• tf-idf scores are from cosine similarity with a sparse matrix from gensim, and
• Entity scores are also FastText-based

[jamesdunham]

• There are 1,891,673 aberrant field scores out of 77,492,102,585
• They occur across fields (e.g., in Arithmetic, Zoology)
• Values range from 1.0000001192092896 to 1.1e+36
• Offending scores can be found in jd1881_sandbox.fos_v2_scores_gt_1, which contains the result of

  SELECT
    merged_id, 
    name,
    field.score AS score
  FROM fields_of_study_v2.field_scores, UNNEST (fields) AS field
  LEFT JOIN fields_of_study_v2.field_meta ON field_id = field.id
  WHERE score > 1
  ORDER BY score DESC