HDF5File.__init() requires a fileID

[wpf5511]

when I process hdf5.open('filepath','r')

th> hdf5.open('bot.hdf5','r')
/opt/torch/install/share/lua/5.1/hdf5/file.lua:10: HDF5File.__init() requires a fileID - perhaps you want HDF5File.create()?
stack traceback:
[C]: in function 'assert'
/opt/torch/install/share/lua/5.1/hdf5/file.lua:10: in function '__init'
/home/wpf/.luarocks/share/lua/5.1/torch/init.lua:91: in function </home/wpf/.luarocks/share/lua/5.1/torch/init.lua:87>
[C]: in function 'open'
[string "_RESULT={hdf5.open('bot.hdf5','r')}"]:1: in main chunk
[C]: in function 'xpcall'
/opt/torch/install/share/lua/5.1/trepl/init.lua:652: in function 'repl'
/opt/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:199: in main chunk
[C]: at 0x00405b50
[0.0011s]
th>

[cpra]

In case anyone runs into this issue, you can fix it as follows. This is not safe wrt. package updates though.

The problem is that hdf5.C.H5Fopen returns fileID as type cdata. To fix this, add the following after local fileID = hdf5.C.H5Fopen(...) in openFunc: fileID = tonumber(fileID). Then you'll probably get another error in group.lua, line 73. To fix this error, replace .. self._groupID .. with .. tostring(self._groupID) ...

[AndreJFBico]

Btw this is still happening on latest version with macos .

[theSundayProgrammer]

@cpra suggestion fixed me partly. There is one more place where the error occurs and I could not trace it (see listing below). So I commented out the offending assert in file.lua and added an explicit conversion
fileID=tonumber(fileID)

listing--------
/home/chakra/torch/install/bin/luajit: /home/chakra/torch/install/share/lua/5.1/hdf5/file.lua:10: HDF5File.__init() requires a fileID - perhaps you want HDF5File.create()?
stack traceback:
[C]: in function 'assert'
/home/chakra/torch/install/share/lua/5.1/hdf5/file.lua:10: in function '__init'
/home/chakra/torch/install/share/lua/5.1/torch/init.lua:91: in function </home/chakra/torch/install/share/lua/5.1/torch/init.lua:87>
[C]: in function 'open'
./util/DataLoader.lua:17: in function '__init'
/home/chakra/torch/install/share/lua/5.1/torch/init.lua:91: in function </home/chakra/torch/install/share/lua/5.1/torch/init.lua:87>
[C]: in function 'DataLoader'
train.lua:76: in main chunk
[C]: in function 'dofile'
...akra/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:150: in main chunk
[C]: at 0x55b81bec1470