code: def iter_scalars(self, run):
      cur = self._db.execute(
          """
            SELECT * FROM scalar
            WHERE run = ?
            ORDER BY 'prefix', 'tag'
          """,
          (run.id,),
      )
      for row in cur.fetchall():
          yield {
              col[0]: row[i] for i, col in enumerate(cur.description)
          }
  
imports: import logging
  import os
  import sqlite3
  from guild import run_util
  from guild import tfevent
  from guild import util
  from guild import var
label_desc: Use image node_id 11 for calling the ScalarReader obj's underlying member method code with example usage: obj.iter_scalars(run) without return types