#1749: Fix fused_batch_norm 5d NDHWC input reshape convert (#1769)

* fix fused_batch_norm 5d input reshape convert

* fix for #1749

Signed-off-by: hwangdeyu <dejack953@outlook.com>

Author: hwangdeyu

tests/test_backend.py

@@ -2817,6 +2817,31 @@ def func(x):
             return tf.identity(y, name=_TFOUTPUT)
         self._run_test_case(func, [_OUTPUT], {_INPUT: x_val}, rtol=1e-04)
 
+    @check_opset_min_version(7, "batchnorm")
+    @check_tf_min_version("2.0", "tf-1.x does not support NDHWC")
+    def test_fused_batchnorm_3d(self):
+        x_shape = [1, 28, 28, 2, 2]
+        x_dtype = np.float32
+        scale_dtype = np.float32
+        scale_shape = [2]
+        data_format = "NDHWC"
+        x_val = np.random.random_sample(x_shape).astype(x_dtype)
+        scale_val = np.random.random_sample(scale_shape).astype(scale_dtype)
+        offset_val = np.random.random_sample(scale_shape).astype(scale_dtype)
+        mean_val = np.random.random_sample(scale_shape).astype(scale_dtype)
+        var_val = np.random.random_sample(scale_shape).astype(scale_dtype)
+        def func(x):
+            scale = tf.constant(scale_val, name='scale')
+            offset = tf.constant(offset_val, name='offset')
+            mean = tf.constant(mean_val, name='mean')
+            var = tf.constant(var_val, name='variance')
+            epsilon = 0.001
+            y, _, _ = fused_batch_norm(
+                x, scale, offset, mean=mean, variance=var,
+                epsilon=epsilon, data_format=data_format, is_training=False)
+            return tf.identity(y, name=_TFOUTPUT)
+        self._run_test_case(func, [_OUTPUT], {_INPUT: x_val}, rtol=1e-04)
+
     @check_opset_min_version(7, "batchnorm")
     @skip_tfjs("TFJS executes model incorrectly")
     def test_fused_batchnorm_training(self):

tf2onnx/onnx_opset/nn.py

@@ -943,6 +943,14 @@ class BatchNorm:
     @classmethod
     def version_6(cls, ctx, node, **kwargs):
         tf_type = node.type
+        input_rank = len(ctx.get_shape(node.input[0]))
+        if input_rank == 4:
+            spatial = 2
+        elif input_rank == 5:
+            spatial = 3
+        else:
+            raise ValueError("node input must be 4 or 5-dimensional, is {} now".format(input_rank))
+
         node.type = "BatchNormalization"
         # tf inputs: x, scale, bias, mean, variance
         # tf outputs: y, batch_mean, batch_var
@@ -973,7 +981,7 @@ def version_6(cls, ctx, node, **kwargs):
             # the setter makes a copy of new_output
             node.output = new_output
 
-        conv_convert_inputs(ctx, node, with_kernel=False)
+        conv_convert_inputs(ctx, node, with_kernel=False, spatial=spatial)
 
         inp_shape = ctx.get_shape(node.input[0])
         inp_rank = len(inp_shape) if inp_shape is not None else None