text: USE_COLS = ['channelGrouping', 'date', 'fullVisitorId', 'sessionId',
         'visitNumber', 'visitStartTime',
         'device.browser',
         'device.deviceCategory', 'device.isMobile',
         'device.operatingSystem',
         'geoNetwork.city',
         #'geoNetwork.continent',
         'geoNetwork.country',
         'geoNetwork.metro',
         'geoNetwork.networkDomain',
         'geoNetwork.region',
         #'geoNetwork.subContinent',
         'totals.bounces', 'totals.hits', 'totals.newVisits', 'totals.pageviews',
         'totals.transactionRevenue', 'trafficSource.adContent',
         'trafficSource.adwordsClickInfo.adNetworkType',
         #'trafficSource.adwordsClickInfo.isVideoAd',
         'trafficSource.adwordsClickInfo.page',
         'trafficSource.adwordsClickInfo.slot',
         'trafficSource.campaign',
         'trafficSource.isTrueDirect',
         'trafficSource.keyword',
         'trafficSource.medium',
         'trafficSource.referralPath',
         'trafficSource.source'
              ]
  
  NUM_COLS = ['totals.bounces', 'totals.hits', 'totals.newVisits', 'totals.pageviews']
  TARGET = ['totals.transactionRevenue']
  