hasdata - Determine if minibatchqueue can return mini-batch - MATLAB (original) (raw)
Main Content
Determine if minibatchqueue can return mini-batch
Since R2020b
Syntax
Description
[tf](#mw%5Ffd7bc4b4-a420-4352-9059-d48b00c33cf2) = hasdata([mbq](#mw%5Ff7fcc6be-12b3-493d-a466-ace18d0f9416%5Fsep%5Fmw%5F1052debc-abad-4547-9b2c-423b954fdb8a)) returns1 (true) if mbq can return a mini-batch using the next function, and 0 (false) otherwise.
Use hasdata in combination with next to iterate over all data in the minibatchqueue object. You can callnext on a minibatchqueue object until all data is returned. If mini-batches of data are still available in the minibatchqueue object,hasdata returns 1. When you reach the end of the data, hasdata returns 0. Then, use reset orshuffle to reset the minibatchqueue object and continue obtaining mini-batches withnext.
Examples
Iterate Over All Mini-Batches
Use hasdata with a while loop to iterate over all data in the minibatchqueue object.
Create a minibatchqueue object from a datastore.
ds = digitDatastore; mbq = minibatchqueue(ds,MiniBatchSize=256)
mbq = minibatchqueue with 1 output and properties:
Mini-batch creation: MiniBatchSize: 256 PartialMiniBatch: 'return' MiniBatchFcn: 'collate' PreprocessingEnvironment: 'serial'
Outputs: OutputCast: {'single'} OutputAsDlarray: 1 MiniBatchFormat: {''} OutputEnvironment: {'auto'}
While data is still available in the minibatchqueue object, obtain the next mini-batch.
while hasdata(mbq) X = next(mbq) end
The loop ends when hasdata returns false, and all mini-batches are returned.
Output Arguments
tf — True or false result
1 | 0
True or false result, returned as a 1 or 0 of data type logical.
Version History
Introduced in R2020b