fix: prompt phi (#1845) [skip ci]

* corecting phi system prompt

* phi test

* update

* add test

src/axolotl/prompters.py

@@ -65,8 +65,10 @@ class AlpacaPrompter(Prompter):
             self.system_format = "<|im_start|>system\n{system}<|im_end|>\n"
         elif self.prompt_style == PromptStyle.PHI.value:
             self.turn_format = "<|user|>\n{instruction}<|end|>{input}<|assistant|>"
-            self.turn_no_input_format = "<|user|>\n{instruction}<|end|><|assistant|>"
+            self.turn_no_input_format = (
-            self.system_format = "<|system|>{system}\n"
+                "<|user|>\n{instruction}<|end|>\n<|assistant|>\n"
+            )
+            self.system_format = "<|system|>\n{system}<|end|>\n"
 
     def _build_result(self, instruction, input_text, output):
         # returns the full prompt from instruction and optional input

tests/test_prompters.py

@@ -42,6 +42,19 @@ class AlpacaPrompterTest(unittest.TestCase):
         assert "USER:" not in res
         assert "ASSISTANT:" not in res
 
+    def test_prompt_style_w_phi(self):
+        prompter = AlpacaPrompter(prompt_style=PromptStyle.PHI.value)
+        res = next(prompter.build_prompt("tell me a joke about the following"))
+        assert (
+            """<|system|>
+Below is an instruction that describes a task. Write a response that appropriately completes the request.<|end|>
+<|user|>
+tell me a joke about the following<|end|>
+<|assistant|>
+"""
+            == res
+        )
+
     def test_prompt_style_w_chat(self):
         prompter = AlpacaPrompter(prompt_style=PromptStyle.CHAT.value)
         res = next(