Algorithms and types associated with MPS, MPO, DMRG, etc have been moved to their own package, ITensorMPS.jl.

ITensor functions are now stricter about giving errors when unrecognized keyword arguments are passed. This change will help catch silent issues in codes.

ITensor now supports multiple GPU types through Julia package extensions, with full support for dense tensor operations on NVIDIA CUDA.

We will be removing the format function from the itensor:: namespace. Click to read more if you rely on this in your C++ code.