Generate: nudge towards `do_sample=False` when `temperature=0.0` (#25722)

src/transformers/generation/logits_process.py

@@ -266,7 +266,13 @@ class TemperatureLogitsWarper(LogitsWarper):
 
     def __init__(self, temperature: float):
         if not isinstance(temperature, float) or not (temperature > 0):
-            raise ValueError(f"`temperature` has to be a strictly positive float, but is {temperature}")
+            except_msg = (
+                f"`temperature` (={temperature}) has to be a strictly positive float, otherwise your next token "
+                "scores will be invalid."
+            )
+            if isinstance(temperature, float) and temperature == 0.0:
+                except_msg += " If you're looking for greedy decoding strategies, set `do_sample=False`."
+            raise ValueError(except_msg)
 
         self.temperature = temperature