ls_init_learn_rate与迭代步骤0的学习率不匹配

Question

如documentation所示，我们已将ls_init_learn_rate调整为匹配上一个加倍的学习率（在本例中为12.8）。但是，在交互步骤0的训练信息中指示的学习率是3.2。

Training Info

此特定模型的查询如下，但是我们也测试了其他模型的相同行为。

#standardSQL
CREATE OR REPLACE MODEL `dataset.table` 
OPTIONS(model_type='logistic_reg', ls_init_learn_rate=12.8) AS
SELECT
  IF(totals.transactions IS NULL, 0, 1) AS label,
  device.operatingSystem AS os,
  device.isMobile AS is_mobile,
  geoNetwork.country AS country,
  totals.pageviews AS pageviews
FROM
  `bigquery-public-data.google_analytics_sample.ga_sessions_*`
WHERE
  _TABLE_SUFFIX BETWEEN '20160801' AND '20160901'
  AND MOD(ABS(FARM_FINGERPRINT(fullVisitorId)), 10) < 7

这是预期的行为吗？