Update nous prompt (#728)

* Bring back EOS token if no preprompt set

* Reflect prompt changes in PROMPTS.md

* Update .env.template

Co-authored-by: Nicolas Patry <patry.nicolas@protonmail.com>

* match prompt in PROMPTS.md

---------

Co-authored-by: Nicolas Patry <patry.nicolas@protonmail.com>

.env.template

@@ -65,7 +65,7 @@ MODELS=`[
       "name" : "NousResearch/Nous-Hermes-2-Mixtral-8x7B-DPO",
       "description" : "Nous Hermes 2 Mixtral 8x7B DPO is the new flagship Nous Research model trained over the Mixtral 8x7B MoE LLM.",
       "websiteUrl" : "https://nousresearch.com/",
-      "chatPromptTemplate" : "<|im_start|>system\n{{#if @root.preprompt}}{{@root.preprompt}}<|im_end|>\n{{/if}}{{#each messages}}{{#ifUser}}<|im_start|>user\n{{content}}<|im_end|>\n<|im_start|>assistant\n{{/ifUser}}{{#ifAssistant}}{{content}}<|im_end|>\n{{/ifAssistant}}{{/each}}",
+      "chatPromptTemplate" : "{{#if @root.preprompt}}<|im_start|>system\n{{@root.preprompt}}<|im_end|>\n{{/if}}{{#each messages}}{{#ifUser}}<|im_start|>user\n{{content}}<|im_end|>\n<|im_start|>assistant\n{{/ifUser}}{{#ifAssistant}}{{content}}<|im_end|>\n{{/ifAssistant}}{{/each}}",
       "promptExamples": [
         {
           "title": "Write an email from bullet list",

PROMPTS.md

@@ -53,5 +53,5 @@ System: {{preprompt}}\nUser:{{#each messages}}{{#ifUser}}{{content}}\nFalcon:{{/
 ## ChatML
 
 ```env
-<|im_start|>system\n{{#if @root.preprompt}}{{@root.preprompt}}<|im_end|>\n{{/if}}{{#each messages}}{{#ifUser}}<|im_start|>user\n{{content}}<|im_end|>\n<|im_start|>assistant\n{{/ifUser}}{{#ifAssistant}}{{content}}<|im_end|>\n{{/ifAssistant}}{{/each}}
+{{#if @root.preprompt}}<|im_start|>system\n{{@root.preprompt}}<|im_end|>\n{{/if}}{{#each messages}}{{#ifUser}}<|im_start|>user\n{{content}}<|im_end|>\n<|im_start|>assistant\n{{/ifUser}}{{#ifAssistant}}{{content}}<|im_end|>\n{{/ifAssistant}}{{/each}}
 ```