Update chat.go

Change data type from float32 to float64 so that when reading MongoDB `Double` won't arise truncate precision issue.

chat.go

@@ -74,13 +74,13 @@ type ChatCompletionRequest struct {
 	Model            string                  `json:"model"`
 	Messages         []ChatCompletionMessage `json:"messages"`
 	MaxTokens        int                     `json:"max_tokens,omitempty"`
-	Temperature      float32                 `json:"temperature,omitempty"`
-	TopP             float32                 `json:"top_p,omitempty"`
+	Temperature      float64                 `json:"temperature"`
+	TopP             float64                 `json:"top_p"`
 	N                int                     `json:"n,omitempty"`
 	Stream           bool                    `json:"stream,omitempty"`
 	Stop             []string                `json:"stop,omitempty"`
-	PresencePenalty  float32                 `json:"presence_penalty,omitempty"`
-	FrequencyPenalty float32                 `json:"frequency_penalty,omitempty"`
+	PresencePenalty  float64                 `json:"presence_penalty,omitempty"`
+	FrequencyPenalty float64                 `json:"frequency_penalty,omitempty"`
 	// LogitBias is must be a token id string (specified by their token ID in the tokenizer), not a word string.
 	// incorrect: `"logit_bias":{"You": 6}`, correct: `"logit_bias":{"1639": 6}`
 	// refs: https://platform.openai.com/docs/api-reference/chat/create#chat/create-logit_bias