add recursive clustering and skeletonization

Author: alexfikl

doc/conf.py

@@ -70,13 +70,13 @@
     "cl_array.Array": "obj:pyopencl.array.Array",
     # pymbolic
     "ArithmeticExpression": "obj:pymbolic.ArithmeticExpression",
+    "ArithmeticExpressionContainerTc":
+        "obj:pymbolic.typing.ArithmeticExpressionContainerTc",
     "Expression": "obj:pymbolic.typing.Expression",
     "MultiVector": "obj:pymbolic.geometric_algebra.MultiVector",
     "Variable": "class:pymbolic.primitives.Variable",
     "prim.Subscript": "class:pymbolic.primitives.Subscript",
     "prim.Variable": "class:pymbolic.primitives.Variable",
-    "ArithmeticExpressionContainerTc":
-        "obj:pymbolic.typing.ArithmeticExpressionContainerTc",
     # arraycontext
     "ArrayContainer": "obj:arraycontext.ArrayContainer",
     "ArrayOrContainerOrScalar": "obj:arraycontext.ArrayOrContainerOrScalar",
@@ -91,6 +91,7 @@
     # boxtree
     "FromSepSmallerCrit": "obj:boxtree.traversal.FromSepSmallerCrit",
     "TimingResult": "class:boxtree.timing.TimingResult",
+    "Tree": "obj:boxtree.tree.Tree",
     "TreeKind": "obj:boxtree.tree_build.TreeKind",
     # sumpy
     "ExpansionBase": "class:sumpy.expansion.ExpansionBase",
@@ -119,6 +120,7 @@
     "pytential.symbolic.dof_desc.DOFDescriptorLike": "data:pytential.symbolic.dof_desc.DOFDescriptorLike",  # noqa: E501
     "pytential.symbolic.primitives.ExpressionNode": "class:pytential.symbolic.primitives.ExpressionNode",  # noqa: E501
     "sym.DOFDescriptor": "class:pytential.symbolic.dof_desc.DOFDescriptor",
+    "sym.DOFDescriptorLike": "obj:pytential.symbolic.dof_desc.DOFDescriptorLike",
     "sym.IntG": "class:pytential.symbolic.primitives.IntG",
     "sym.var": "obj:pytential.symbolic.primitives.var",
 }

doc/linalg.rst

@@ -32,6 +32,7 @@ Low-level Functionality
     All the classes and routines in this module are experimental and the
     API can change at any point.
 
+.. automodule:: pytential.linalg.cluster
 .. automodule:: pytential.linalg.proxy
 .. automodule:: pytential.linalg.skeletonization