关于“Predict Bike Trip Duration with a Regression Model in BQML 2.5”的评价

I enjoyed the lab

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Warning, the duration column has NULL values. May be fixed with 'WHERE duration IS NOT NULL' to be able to create the model.

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error LAB : Predict Bike Trip Duration with a Regression Model in BQML 2.5 2 Enter the following query into the query editor: CREATE OR REPLACE MODEL bike_model.model OPTIONS (input_label_cols=['duration'], model_type='linear_reg') AS SELECT duration, start_station_name, CAST(EXTRACT(dayofweek FROM start_date) AS STRING) AS dayofweek, CAST(EXTRACT(hour FROM start_date) AS STRING) AS hourofday FROM `bigquery-public-data`.london_bicycles.cycle_hire quarry failed with error "Label column 'duration' has NULL values"

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