UML and Call Charts for pytensor_from_scratch

.gitignore

@@ -165,7 +165,7 @@ cython_debug/
 #  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
-#.idea/
+# .idea/
 
 # PyPI configuration file
 .pypirc

data/pytensor_from_scratch.py.md

@@ -0,0 +1,68 @@
+```mermaid
+---
+title: scripts/pytensor_from_scratch.py
+---
+classDiagram
+    class Type
+
+    class Op {
+        - __str__(self) str
+    }
+
+    class Node
+
+    class Variable {
+        - __init__(self, name, *, type) None
+        - __repr__(self) str
+    }
+
+    class Apply {
+        - __init__(self, op, inputs, outputs) None
+        - __repr__(self) str
+    }
+
+    class TensorType {
+        - __init__(self, shape, dtype) None
+        - __eq__(self, other)
+        - __repr__(self) str
+    }
+
+    class Add {
+        + make_node(self, a, b)
+    }
+
+    class Sum {
+        + make_node(self, a)
+    }
+
+    class Constant {
+        - __init__(self, data, *, type) None
+        - __repr__(self) str
+    }
+
+    class Sum {
+        - __init__(self, axis) None
+        + make_node(self, a)
+        + perform(self, inputs)
+        - __str__(self) str
+    }
+
+    class Mul {
+        + make_node(self, a, b)
+        + perform(self, inputs)
+    }
+
+    Variable --|> Node
+
+    Apply --|> Node
+
+    TensorType --|> Type
+
+    Add --|> Op
+
+    Sum --|> Op
+
+    Constant --|> Variable
+
+    Mul --|> Op
+```