An InstanceList which avoids OutOfMemoryErrors by saving Instances to disk when there is not enough memory to create a new Instance. It implements a fixed-size paging scheme, where each page on disk stores
instancesPerPage Instances. So, while the number of Instances per pages is constant, the size in bytes of each page may vary. Using this class instead of InstanceList means the number of Instances you can store is essentially limited only by disk size (and patience). The paging scheme is optimized for the most frequent case of looping through the InstanceList from index 0 to n. If there are n instances, then instances 0->(n/size()) are stored together on page 1, instances (n/size)+1 -> 2*(n/size) are on page 2, ... etc. This way, pages adjacent in the
instances list will usually be in the same page.
@see InstanceList
@author Aron Culotta
culotta@cs.umass.edu