Sampling: Add additive param to overrides

Additive is used to add collections together. Currently, it's used
for lists, but it can be used for dictionaries in the future.

Signed-off-by: kingbri <bdashore3@proton.me>

common/sampling.py

@@ -325,6 +325,16 @@ def apply_forced_sampler_overrides(params: BaseSamplerRequest):
 
     for var, value in overrides.items():
         override = value.get("override")
-        force = unwrap(value.get("force"), False)
-        if force and override:
-            setattr(params, var, override)
+        original_value = getattr(params, var, None)
+
+        # Force takes precedence over additive
+        # Additive only works on lists and doesn't remove duplicates
+        if override:
+            if unwrap(value.get("force"), False):
+                setattr(params, var, override)
+            elif (
+                unwrap(value.get("additive"), False)
+                and isinstance(override, list)
+                and isinstance(original_value, list)
+            ):
+                setattr(params, var, override + original_value)

sampler_overrides/sample_preset.yml

@@ -14,6 +14,7 @@ max_tokens:
 stop:
   override: []
   force: false
+  additive: false
 token_healing:
   override: false
   force: false
@@ -104,6 +105,7 @@ ban_eos_token:
 logit_bias:
   override:
   force: false
+  additive: false
 
 # MARK: CFG scale
 cfg_scale: