TextLoader.Options.AllowSparse Field
Definition
Important
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Whether the input may include sparse representations. For example, a row containing "5 2:6 4:3" means that there are 5 columns, and the only non-zero are columns 2 and 4, which have values 6 and 3, respectively. Column indices are zero-based, so columns 2 and 4 represent the 3rd and 5th columns. A column may also have dense values followed by sparse values represented in this fashion. For example, a row containing "1 2 5 2:6 4:3" represents two dense columns with values 1 and 2, followed by 5 sparsely represented columns with values 0, 0, 6, 0, and 3. The indices of the sparse columns start from 0, even though 0 represents the third column.
In addition, InputSize should be used when the number of sparse elements (5 in this example) is not present in each line. It should specify the total size, not just the size of the sparse part. However, indices of the spars part are relative to where the sparse part begins. If InputSize is set to 7, the line "1 2 2:6 4:3" will be mapped to "1 2 0 0 6 0 4", but if set to 10, the same line will be mapped to "1 2 0 0 6 0 4 0 0 0".
public bool AllowSparse;val mutable AllowSparse : boolPublic AllowSparse As Boolean