Float16 Datasets not supported

[G-nn-r]

While it is very nice to see that float16 values (e.g., as object attributes) are finally supported since 3.3.2, unfortunately float16 datasets are not supported yet.

Example code to create a malicious h5 with Python:

import h5py
import numpy as np

with h5py.File(r"C:\temp\hdf5_test.h5", mode='w') as f:
    dset16 = f.create_dataset("dataset_float16", data=np.eye(5, dtype=np.float16))  # this cannot be opened in HDFView
    dset32 = f.create_dataset("dataset_float32", data=np.eye(5, dtype=np.float32))  # this can be opened in HDFView

Error messages when trying to open the dataset

For opening as a spreadsheet (table):

An error occured while loading data for the table:
failed to read scalar dataset: Inappropriate type

The bottom of the HDFView windows says this:

 *** Error: unable to load table data *** 

The log shows this message:

java.lang.Exception: failed to read scalar dataset: Inappropriate type
        at hdf.object.h5.H5ScalarDS.read(H5ScalarDS.java:871)
        at hdf.view.dialog.DataOptionDialog$PreviewNavigator.createPreviewImage(DataOptionDialog.java:1789)
        at hdf.view.dialog.DataOptionDialog$PreviewNavigator.<init>(DataOptionDialog.java:1627)
        at hdf.view.dialog.DataOptionDialog.createScalarDSContents(DataOptionDialog.java:1149)
        at hdf.view.dialog.DataOptionDialog.open(DataOptionDialog.java:230)
        at hdf.view.TreeView.DefaultTreeView.showDataContent(DefaultTreeView.java:2945)
        at hdf.view.MetaDataView.DefaultDatasetMetaDataView$1.widgetSelected(DefaultDatasetMetaDataView.java:302)
        at swt/org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:252)
        at swt/org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
        at swt/org.eclipse.swt.widgets.Display.sendEvent(Display.java:4256)
        at swt/org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1066)
        at swt/org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4054)
        at swt/org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3642)
        at hdf.view.HDFView.runMainWindow(HDFView.java:438)
        at hdf.view.HDFView$41.run(HDFView.java:2822)
        at swt/org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:183)
        at swt/org.eclipse.swt.widgets.Display.syncExec(Display.java:4785)
        at hdf.view.HDFView.main(HDFView.java:2812)
Caused by: java.lang.Exception: Inappropriate type
        at hdf.object.h5.H5ScalarDS.scalarDatasetCommonIO(H5ScalarDS.java:1021)
        at hdf.object.h5.H5ScalarDS.read(H5ScalarDS.java:867)
        ... 17 more
Caused by: hdf.hdf5lib.exceptions.HDF5FunctionArgumentException: Inappropriate type
        at [email protected]/hdf.hdf5lib.H5.H5Dread_short(Native Method)
        at [email protected]/hdf.hdf5lib.H5.H5Dread(H5.java:2986)
        at [email protected]/hdf.hdf5lib.H5.H5Dread(H5.java:2928)
        at hdf.object.h5.H5ScalarDS.scalarDatasetCommonIO(H5ScalarDS.java:1010)
        ... 18 more

For opening as an image

Select
ImageView:

The bottom of the HDFView windows says this:

 *** Loading image failed - dataset_float16 *** 

The log shows this error (seems to be identical to the one above):

java.lang.Exception: failed to read scalar dataset: Inappropriate type
        at hdf.object.h5.H5ScalarDS.read(H5ScalarDS.java:871)
        at hdf.view.dialog.DataOptionDialog$PreviewNavigator.createPreviewImage(DataOptionDialog.java:1789)
        at hdf.view.dialog.DataOptionDialog$PreviewNavigator.<init>(DataOptionDialog.java:1627)
        at hdf.view.dialog.DataOptionDialog.createScalarDSContents(DataOptionDialog.java:1149)
        at hdf.view.dialog.DataOptionDialog.open(DataOptionDialog.java:230)
        at hdf.view.TreeView.DefaultTreeView.showDataContent(DefaultTreeView.java:2945)
        at hdf.view.MetaDataView.DefaultDatasetMetaDataView$1.widgetSelected(DefaultDatasetMetaDataView.java:302)
        at swt/org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:252)
        at swt/org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
        at swt/org.eclipse.swt.widgets.Display.sendEvent(Display.java:4256)
        at swt/org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1066)
        at swt/org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4054)
        at swt/org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3642)
        at hdf.view.HDFView.runMainWindow(HDFView.java:438)
        at hdf.view.HDFView$41.run(HDFView.java:2822)
        at swt/org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:183)
        at swt/org.eclipse.swt.widgets.Display.syncExec(Display.java:4785)
        at hdf.view.HDFView.main(HDFView.java:2812)
Caused by: java.lang.Exception: Inappropriate type
        at hdf.object.h5.H5ScalarDS.scalarDatasetCommonIO(H5ScalarDS.java:1021)
        at hdf.object.h5.H5ScalarDS.read(H5ScalarDS.java:867)
        ... 17 more
Caused by: hdf.hdf5lib.exceptions.HDF5FunctionArgumentException: Inappropriate type
        at [email protected]/hdf.hdf5lib.H5.H5Dread_short(Native Method)
        at [email protected]/hdf.hdf5lib.H5.H5Dread(H5.java:2986)
        at [email protected]/hdf.hdf5lib.H5.H5Dread(H5.java:2928)
        at hdf.object.h5.H5ScalarDS.scalarDatasetCommonIO(H5ScalarDS.java:1010)
        ... 18 more

H5Dump

h5dump displays the contents correctly:

HDF5 "hdf5_test.h5" {
GROUP "/" {
   DATASET "dataset_float16" {
      DATATYPE  16-bit little-endian floating-point 16-bit precision
      DATASPACE  SIMPLE { ( 5, 5 ) / ( 5, 5 ) }
      DATA {
      (0,0): 1, 0, 0, 0, 0,
      (1,0): 0, 1, 0, 0, 0,
      (2,0): 0, 0, 1, 0, 0,
      (3,0): 0, 0, 0, 1, 0,
      (4,0): 0, 0, 0, 0, 1
      }
   }
   DATASET "dataset_float32" {
      DATATYPE  H5T_IEEE_F32LE
      DATASPACE  SIMPLE { ( 5, 5 ) / ( 5, 5 ) }
      DATA {
      (0,0): 1, 0, 0, 0, 0,
      (1,0): 0, 1, 0, 0, 0,
      (2,0): 0, 0, 1, 0, 0,
      (3,0): 0, 0, 0, 1, 0,
      (4,0): 0, 0, 0, 0, 1
      }
   }
}
}

Tested on

• Platform: Windows 10
• HDFView Versions: 3.3.2 and 99.99.99