fix drop_prob type for paddle develop (#7681)

ppdet/modeling/backbones/transformer_utils.py

@@ -32,7 +32,7 @@ def drop_path(x, drop_prob=0., training=False):
     """
     if drop_prob == 0. or not training:
         return x
-    keep_prob = paddle.to_tensor(1 - drop_prob)
+    keep_prob = paddle.to_tensor(1 - drop_prob, dtype=x.dtype)
     shape = (paddle.shape(x)[0], ) + (1, ) * (x.ndim - 1)
     random_tensor = keep_prob + paddle.rand(shape, dtype=x.dtype)
     random_tensor = paddle.floor(random_tensor)  # binarize