1.4.0

Enhancements

• Add 2D tensor network support and algorithms
• Add 3D tensor network infrastructure
• Add arbitrary geometry quantum state infrastructure
• Many changes to :class:TNOptimizer
• Many changes to TN drawing
• Many changes to :class:Circuit simulation
• Many improvements to TN simplification
• Make all tag and index operations deterministic
• Add :func:~quimb.tensor.tensor_core.tensor_network_sum,
  :func:~quimb.tensor.tensor_core.tensor_network_distance and
  :meth:~quimb.tensor.tensor_core.TensorNetwork.fit
• Various memory and performance improvements
• Various graph generators and TN builders