fix file preview in file management (#1151)

### What problem does this PR solve?

fix file preview in file management

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

rag/app/picture.py

@@ -24,11 +24,6 @@ ocr = OCR()
 
 
 def chunk(filename, binary, tenant_id, lang, callback=None, **kwargs):
-    try:
-        cv_mdl = LLMBundle(tenant_id, LLMType.IMAGE2TEXT, lang=lang)
-    except Exception as e:
-        callback(prog=-1, msg=str(e))
-        return []
     img = Image.open(io.BytesIO(binary)).convert('RGB')
     doc = {
         "docnm_kwd": filename,
@@ -45,6 +40,7 @@ def chunk(filename, binary, tenant_id, lang, callback=None, **kwargs):
 
     try:
         callback(0.4, "Use CV LLM to describe the picture.")
+        cv_mdl = LLMBundle(tenant_id, LLMType.IMAGE2TEXT, lang=lang)
         ans = cv_mdl.describe(binary)
         callback(0.8, "CV LLM respoond: %s ..." % ans[:32])
         txt += "\n" + ans

rag/llm/cv_model.py

@@ -78,7 +78,7 @@ class GptV4(Base):
         prompt = self.prompt(b64)
         for i in range(len(prompt)):
             for c in prompt[i]["content"]:
-                if "type" in c: del c["type"]
+                if "text" in c: c["type"] = "text"
 
         res = self.client.chat.completions.create(
             model=self.model_name,

rag/llm/embedding_model.py

@@ -15,7 +15,6 @@
 #
 import re
 from typing import Optional
-
 import requests
 from huggingface_hub import snapshot_download
 from zhipuai import ZhipuAI
@@ -344,4 +343,4 @@ class InfinityEmbed(Base):
     def encode_queries(self, text: str) -> tuple[np.ndarray, int]:
         # Using the internal tokenizer to encode the texts and get the total
         # number of tokens
-        return self.encode([text])
+        return self.encode([text])