model: add DSpark support for Nemotron3.5 (#27804)

* model: add DSpark support for Nemotron3.5

* Update src/models/dflash.cpp

Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@huggingface.co>

---------

Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@huggingface.co>
Co-authored-by: Xuan Son Nguyen <son@huggingface.co>

gguf-py/gguf/constants.py

@@ -167,6 +167,7 @@ class Keys:
         SELECTOR_RANK                     = "{arch}.selector_rank"
         SELECTOR_TOP_K                    = "{arch}.selector_top_k"
         SAMPLE_FROM_ANCHOR                = "{arch}.sample_from_anchor"
+        HAS_CONFIDENCE_HEAD               = "{arch}.has_confidence_head"
         NORM_BEFORE_RESIDUAL              = "{arch}.norm_before_residual"
         NORM_BEFORE_FC                    = "{arch}.norm_before_fc"
 

gguf-py/gguf/gguf_writer.py

@@ -1008,6 +1008,9 @@ class GGUFWriter:
     def add_sample_from_anchor(self, value: bool) -> None:
         self.add_bool(Keys.LLM.SAMPLE_FROM_ANCHOR.format(arch=self.arch), value)
 
+    def add_has_confidence_head(self, value: bool) -> None:
+        self.add_bool(Keys.LLM.HAS_CONFIDENCE_HEAD.format(arch=self.arch), value)
+
     def add_target_layers(self, value: Sequence[int]) -> None:
         self.add_array(Keys.LLM.TARGET_LAYERS.format(arch=self.arch), value)