added txrm_loader_wo_virtual_stack

• Added the TXRM loader without virtual stack optionality (however I have an idea for this).
• Moved internal function _get_h5_dataset_keys function outside the DataLoader class
• Fixed issue with memory mapping for TIFF directories, which were not utilizing memory mapping although displaying it so

qim3d/io/load.py

@@ -15,7 +15,7 @@ class DataLoader:
 
     Args:
         virtual_stack (bool, optional): Specifies whether to use virtual stack
-        when loading TIFF files. Default is False.
+        when loading files. Default is False.
 
     Attributes:
         virtual_stack (bool): Specifies whether virtual stack is enabled.
@@ -24,6 +24,7 @@ class DataLoader:
         load_tiff(path): Load a TIFF file from the specified path.
         load_h5(path): Load an HDF5 file from the specified path.
         load_tiff_stack(path): Load a stack of TIFF files from the specified path.
+        load_txrm(path): Load a TXRM/TXM/XRM file from the specified path
         load(path): Load a file or directory based on the given path.
 
     Raises:
@@ -40,7 +41,7 @@ class DataLoader:
         Args:
             path (str): The path to the file or directory.
             virtual_stack (bool, optional): Specifies whether to use virtual
-            stack when loading TIFF and HDF5 files. Default is False.
+            stack when loading files. Default is False.
             dataset_name (str, optional): Specifies the name of the dataset to be loaded
             in case multiple dataset exist within the same file. Default is None (only for HDF5 files)
             return_metadata (bool, optional): Specifies whether to return metadata or not. Default is False (only for HDF5 files)
@@ -230,6 +231,9 @@ class DataLoader:
         log.info("Loaded shape: %s", vol.shape)
         log.info("Using %s of memory", sizeof(sys.getsizeof(vol)))
 
+        if self.virtual_stack:
+            raise NotImplementedError("Using virtual stack for TXRM files is not implemented yet")
+
         if self.return_metadata:
             return vol, metadata
         else: