Resolve "Operation Evaluation"

• Adds tests and implementation for evaluate_output function that takes a list of input values, and returns the output values calculated.
• Remove old evaluate_outputs method that isn't part of the architecture anymore.
• Add Butterfly core operation to have an operation to use in testcases for multiple outputs.

Request review from @jacwa448 @ivaha717

Closes #5 (closed)

b_asic/core_operations.py

@@ -4,10 +4,8 @@ TODO: More info.
 """
 
 from numbers import Number
-from typing import Any
 from numpy import conjugate, sqrt, abs as np_abs
 from b_asic.port import InputPort, OutputPort
-from b_asic.graph_id import GraphIDType
 from b_asic.operation import AbstractOperation
 from b_asic.graph_component import Name, TypeName
 
@@ -335,3 +333,28 @@ class ConstantDivision(AbstractOperation):
     @property
     def type_name(self) -> TypeName:
         return "cdiv"
+
+
+class Butterfly(AbstractOperation):
+    """Butterfly operation that returns two outputs.
+    The first output is a + b and the second output is a - b.
+    TODO: More info.
+    """
+
+    def __init__(self, source1: OutputPort = None, source2: OutputPort = None, name: Name = ""):
+        super().__init__(name)
+        self._input_ports = [InputPort(0, self), InputPort(1, self)]
+        self._output_ports = [OutputPort(0, self), OutputPort(1, self)]
+
+        if source1 is not None:
+            self._input_ports[0].connect(source1)
+
+        if source2 is not None:
+            self._input_ports[1].connect(source2)
+
+    def evaluate(self, a, b):
+        return a + b, a - b
+
+    @property
+    def type_name(self) -> TypeName:
+        return "bfly"