A pointer to the DATASET structure
to which this sample belongs.
RETURNS
A pointer to a SAMPLE structure if all went well, NULL if an error
occured.
FUNCTION
This routine reads a sample from an opened stream. See
DATASET-IO-format for the layout. The function malloc_sample
is used to allocate the DATASET structure.
First, the SAMPLE structure's Input vector is allocated and read.
Then, if the dataset is an IOSET (see DATASET-flags), an output
vector is allocated and read using fscanf_io_pattern. If the dataset
is a LABELSET, the function fscanf_pattern is called; the class
return value is stored in sample->Output.Label,pattern in sample->Input.
NOTE
This function is used by the fscanf_dataset function.
The dset argument is necessary to know how long the input and output vectors
are (dset->NumInputs and dset->NumOutputs) and if the dataset is an
IOSET or a LABELSET.
