v0.5.4

• Fix TensorField.sparse() for no duplicate coordinates
• Skip unnecessary spmm if SparseTensor.initialize_coordinates() has no duplicate coordinates
• Model summary utility function added
• TensorField.splat function for splat features to a sparse tensor
• SparseTensor.interpolate function for extracting interpolated features
• coordinate_key property function for SparseTensor and TensorField
• Fix .dense() for GPU tensors. (PR #319)