transformers: correctly load automodels (#1643)

* backends(transformers): use AutoModel with LLM types

* examples: animagine-xl

* Add codellama examples

embedded/models/transformers-tinyllama.yaml

@@ -0,0 +1,32 @@
+name: tinyllama-chat
+backend: transformers
+type: AutoModelForCausalLM
+
+parameters:
+  model: TinyLlama/TinyLlama-1.1B-Chat-v1.0
+  temperature: 0.2
+  top_k: 40
+  seed: -1
+  top_p: 0.95
+  max_tokens: 4096
+
+template:
+  chat_message: |
+    <|im_start|>{{if eq .RoleName "assistant"}}assistant{{else if eq .RoleName "system"}}system{{else if eq .RoleName "user"}}user{{end}}
+    {{if .Content}}{{.Content}}{{end}}<|im_end|>
+  chat: |
+    {{.Input}}
+    <|im_start|>assistant
+    
+  completion: |
+    {{.Input}}
+
+stopwords:
+- <|im_end|>
+
+usage: |
+      curl http://localhost:8080/v1/chat/completions -H "Content-Type: application/json" -d '{
+        "model": "tinyllama-chat",
+        "messages": [{"role": "user", "content": "Say this is a test!"}],
+        "temperature": 0.7
+      }'