Create deephashloss.py

ppcls/loss/deephashloss.py

+            # do binarize
+            if self.config["Global"].get("feature_binarize") == "round":
+                batch_feas = paddle.round(batch_feas).astype("float32") * 2.0 - 1.0
+
+            if self.config["Global"].get("feature_binarize") == "sign":
+                batch_feas = paddle.sign(batch_feas).astype("float32")