Speedup deepcopy for Rating objects (#108)

* Speedup deepcopy

Signed-off-by: Vivek Joshy <8206808+vivekjoshy@users.noreply.github.com>

* Add changelog

Signed-off-by: Vivek Joshy <8206808+vivekjoshy@users.noreply.github.com>

---------

Signed-off-by: Vivek Joshy <8206808+vivekjoshy@users.noreply.github.com>

changes/108.feature.rst

@@ -0,0 +1 @@
+Optimize rating objects for deepcopy

openskill/models/weng_lin/bradley_terry_full.py

@@ -75,6 +75,11 @@ def __str__(self) -> str:
     def __hash__(self) -> int:
         return hash((self.id, self.mu, self.sigma))
 
+    def __deepcopy__(self, memodict={}):
+        blf = BradleyTerryFullRating(self.mu, self.sigma, self.name)
+        blf.id = self.id
+        return blf
+
     def __eq__(self, other: object) -> bool:
         if isinstance(other, BradleyTerryFullRating):
             if self.mu == other.mu and self.sigma == other.sigma:

openskill/models/weng_lin/bradley_terry_part.py

@@ -80,6 +80,11 @@ def __str__(self) -> str:
     def __hash__(self) -> int:
         return hash((self.id, self.mu, self.sigma))
 
+    def __deepcopy__(self, memodict={}):
+        blp = BradleyTerryPartRating(self.mu, self.sigma, self.name)
+        blp.id = self.id
+        return blp
+
     def __eq__(self, other: object) -> bool:
         if isinstance(other, BradleyTerryPartRating):
             if self.mu == other.mu and self.sigma == other.sigma:

openskill/models/weng_lin/plackett_luce.py

@@ -4,6 +4,7 @@
 """
 import copy
 import itertools
+import marshal
 import math
 import uuid
 from functools import reduce
@@ -74,6 +75,11 @@ def __str__(self) -> str:
     def __hash__(self) -> int:
         return hash((self.id, self.mu, self.sigma))
 
+    def __deepcopy__(self, memodict={}):
+        plr = PlackettLuceRating(self.mu, self.sigma, self.name)
+        plr.id = self.id
+        return plr
+
     def __eq__(self, other: object) -> bool:
         if isinstance(other, PlackettLuceRating):
             if self.mu == other.mu and self.sigma == other.sigma:

openskill/models/weng_lin/thurstone_mosteller_full.py

@@ -83,6 +83,11 @@ def __str__(self) -> str:
     def __hash__(self) -> int:
         return hash((self.id, self.mu, self.sigma))
 
+    def __deepcopy__(self, memodict={}):
+        tmf = ThurstoneMostellerFullRating(self.mu, self.sigma, self.name)
+        tmf.id = self.id
+        return tmf
+
     def __eq__(self, other: object) -> bool:
         if isinstance(other, ThurstoneMostellerFullRating):
             if self.mu == other.mu and self.sigma == other.sigma:

openskill/models/weng_lin/thurstone_mosteller_part.py

@@ -84,6 +84,11 @@ def __str__(self) -> str:
     def __hash__(self) -> int:
         return hash((self.id, self.mu, self.sigma))
 
+    def __deepcopy__(self, memodict={}):
+        tmp = ThurstoneMostellerPartRating(self.mu, self.sigma, self.name)
+        tmp.id = self.id
+        return tmp
+
     def __eq__(self, other: object) -> bool:
         if isinstance(other, ThurstoneMostellerPartRating):
             if self.mu == other.mu and self.sigma == other.sigma: