MLBEDSW-3350 Put softmax on CPU if beta < 0

Put softmax on CPU if beta < 0

Signed-off-by: Patrik Gustavsson <patrik.gustavsson@arm.com>
Change-Id: I4ec866dd44d14e2737c4cd96474e54bb770bfb3e

1 files changed, 8 insertions, 0 deletions

diff --git a/ethosu/vela/supported_operators.py b/ethosu/vela/supported_operators.py
index b537b650..46f7a5d3 100644
--- a/ethosu/vela/supported_operators.py
+++ b/ethosu/vela/supported_operators.py
@@ -212,6 +212,7 @@ class SupportedOperators:
         # Softmax specific checks:
         self.specific_constraints[Op.Softmax].append(SupportedOperators.constraint_matching_shapes)
         self.specific_constraints[Op.Softmax].append(SupportedOperators.constraint_matching_in_out_types)
+        self.specific_constraints[Op.Softmax].append(SupportedOperators.constraint_beta_value_range)
 
         # SplitV specific checks:
         self.specific_constraints[Op.SplitV].append(SupportedOperators.constraint_splitv_inferred)
@@ -560,6 +561,13 @@ class SupportedOperators:
         return valid, f"Op has ifm_dtype={ifm_dtype} and ofm_dtype={ofm_dtype}"
 
     @staticmethod
+    def constraint_beta_value_range(op):
+        "Beta value needs to be positive"
+        beta = op.attrs.get("beta", 1.0)
+        valid = beta >= 0
+        return valid, f"Op has beta={beta}"
+
+    @staticmethod
     def constraint_filter_type(op):
         "Kernel filter values for both width and height must be integer types"
         w = op.kernel.width