update for v1.7.0

docs/changelog.md

@@ -3,7 +3,7 @@
 Release notes for `quimb`.
 
 (whats-new-1-7-0)=
-## v1.7.0 (unreleased)
+## v1.7.0 (12-08-2023)
 
 **Breaking Changes**
 
@@ -24,6 +24,7 @@ Release notes for `quimb`.
 * add [quimb.schematic.Drawing](quimb.schematic.Drawing) from experimental
   submodule, add example docs at {ref}`schematic`. Add methods `text_between`,
   `wedge`, `line_offset` and other tweaks for future use by main TN drawing.
+- upgrade all contraction to use `cotengra` as the backend
 - [`Circuit`](quimb.tensor.Circuit) : allow any gate to be controlled by any
   number of qubits.
 - [`Circuit`](quimb.tensor.Circuit) : support for parsing `openqasm2`
@@ -38,6 +39,18 @@ Release notes for `quimb`.
   without casting as a [TensorNetwork1D](quimb.tensor.TensorNetwork1D).
 - add [MatrixProductState.from_fill_fn](quimb.tensor.tensor_1d.MatrixProductState.from_fill_fn)
   for constructing MPS from a function that fills the tensors.
+- add [Tensor.idxmin](quimb.tensor.Tensor.idxmin) and
+  [Tensor.idxmax](quimb.tensor.Tensor.idxmax) for finding the index of the
+  minimum/maximum element.
+- 2D and 3D classical partition function TN builders: allow output indices.
+- [`quimb.experimental.belief_propagation`]([`quimb.experimental.belief_propagation`]):
+  add various 1-norm/2-norm dense/lazy BP algorithms.
+
+**Bug fixes:**
+
+- fixed bug where an output index could be removed by squeezing when
+  performing tensor network simplifications.
+
 
 (whats-new-1-6-0)=
 ## v1.6.0 (2023-09-10)

quimb/tensor/circuit.py

@@ -241,7 +241,9 @@ def parse_openqasm2_str(contents):
             # then combine this full gate definition, without newlines
             gate_body = "".join(gate_lines)
             # separate the signature and body
-            gate_sig, gate_body = re.match("(.*)\s*{(.*)}", gate_body).groups()
+            gate_sig, gate_body = re.match(
+                r"(.*)\s*{(.*)}", gate_body
+            ).groups()
 
             # parse the signature
             match = rgxs["gate_sig"].match(gate_sig)

quimb/tensor/tensor_2d.py

@@ -4483,7 +4483,8 @@ def bond(self, coo1, coo2):
         return b_ix
 
     def bond_size(self, coo1, coo2):
-        """Return the size of the bond between sites at ``coo1`` and ``coo2``.
+        """Return the (combined) size of the bond(s) between sites at ``coo1``
+        and ``coo2``.
         """
         b_ix = self.bond(coo1, coo2)
         return self[coo1].ind_size(b_ix)
@@ -5055,7 +5056,7 @@ def from_fill_fn(
             The number of columns.
         bond_dim : int
             The bond dimension.
-        physical : int, optional
+        phys_dim : int, optional
             The physical indices dimension.
         shape : str, optional
             How to layout the indices of the tensors, the default is