修复价差识别bug。

strategy/src/predictor.rs

@@ -303,7 +303,11 @@ impl Predictor {
             .count();
         if fair_price_count != 0 {
             self.fair_price = fair_price_sum / Decimal::from(fair_price_count);
-            self.spread_vec.push_back(((self.fair_price - self.mid_price) / self.mid_price).abs());
+
+            let mut spread_abs = ((self.fair_price - self.mid_price) / self.mid_price).abs();
+            spread_abs.rescale(5);
+
+            self.spread_vec.push_back(spread_abs);
             let max_abs_value = self.spread_vec.deque.iter().max().unwrap().clone();
 
             let prev_open = self.params.open.clone();