The daily number of unique visitors with import_logs.py is inflated (two to six fold) compared to the number of unique IP addresses from my apache logs. I am using --enable-http-redirect, --enable-bots only and did not change any other configuration parameter in my installation.
Since I am importing logs and not using cookies, I expected the unique visitor count in Piwik to closely match the number of unique IPs from the weblogs. This is the case in my Webtrends installation with the same exact weblogs. What could inflate the number of unique visitors in Piwik?