Query: The interesting point is that it also seems each time they come across a new  dataset it is simply replaced.

Relevant passages:
SeaLifeBase <=SEP=> SeaLifeBase is a global online database of information about marine life . It aims to provide key information on the taxonomy , distribution and ecology of all marine species in the world apart from finfish . SeaLifeBase is in partnership with the WorldFish Center in Malaysia and the UBC Fisheries Centre at the University of British Columbia . Daniel Pauly is the principal investigator and it is coordinated by Maria Lourdes D. Palomares . , it included descriptions of 74,000 species , 47,700 common names , 12,400 pictures , and references to 31,700 works in the scientific literature . SeaLifeBase complements FishBase , which provides parallel information for finfish .

Cross-validation (statistics) <=SEP=> Cross-validation , sometimes called rotation estimation , is a model validation technique for assessing how the results of a statistical analysis will generalize to an independent data set . It is mainly used in settings where the goal is prediction , and one wants to estimate how accurately a predictive model will perform in practice . In a prediction problem , a model is usually given a dataset of known data on which training is run ( training dataset ) , and a dataset of unknown data ( or first seen data ) against which the model is tested ( testing dataset ) . The goal of cross validation is to define a dataset to `` test '' the model in the training phase ( i.e. , the validation dataset ) , in order to limit problems like overfitting , give an insight on how the model will generalize to an independent dataset ( i.e. , an unknown dataset , for instance from a real problem ) , etc. .   One round of cross-validation involves partitioning a sample of data into complementary subsets , performing the analysis on one subset ( called the training set ) , and validating the analysis on the other subset ( called the validation set or testing set ) . To reduce variability , multiple rounds of cross-validation are performed using different partitions , and the validation results are averaged over the rounds .   One of the main reasons for using cross-validation instead of using the conventional validation ( e.g. partitioning the data set into two sets of 70 % for training and 30 % for test ) is that there is not enough data available to partition it into separate training and test sets without losing significant modelling or testing capability . In these cases , a fair way to properly estimate model prediction performance is to use cross-validation as a powerful general technique .   In summary , cross-validation combines ( averages ) measures of fit ( prediction error ) to derive a more accurate estimate of model prediction performance .

They <=SEP=> They is the third-person plural personal pronoun ( subjective case ) in Modern English . It can also be used with singular meaning , particularly in informal contexts , sometimes to avoid specifying the gender of the person referred to .

ZFS <=SEP=> ZFS is a combined file system and logical volume manager designed by Sun Microsystems . The features of ZFS include protection against data corruption , support for high storage capacities , efficient data compression , integration of the concepts of filesystem and volume management , snapshots and copy-on-write clones , continuous integrity checking and automatic repair , RAID-Z and native NFSv4 ACLs .   The ZFS name is registered as a trademark of Oracle Corporation ; although it was briefly given the retrofitted expanded name `` Zettabyte File System '' , it is no longer considered an initialism .  Originally , ZFS was proprietary , closed-source software developed internally by Sun as part of Solaris , with a team led by the CTO of Sun 's storage business unit and Sun Fellow , Jeff Bonwick .  In 2005 , the bulk of Solaris , including ZFS , was licensed as open-source software under the Common Development and Distribution License ( CDDL ) , as the OpenSolaris project . ZFS became a standard feature of Solaris 10 in June 2006 .   In 2010 , Oracle stopped the releasing of source code for new OpenSolaris and ZFS development , effectively forking their closed-source development from the open-source branch . In response , OpenZFS was created as a new open-source development umbrella project , aiming at bringing together individuals and companies that use the ZFS filesystem in an open-source manner .