MLBEDSW-3772 Fix FC with changed inp shape

When FC input is fixed by changing ifm_shape,
avoid_NHCWB16 must be set to ifm.

-Fixed issue with ResizeBilinear
-Changed to post order for concat ops in graph optimisation

Signed-off-by: Patrik Gustavsson <patrik.gustavsson@arm.com>
Change-Id: Ie0c6a86637c210c0833ae9b2f8e7c494c5d4f66e

1 files changed, 20 insertions, 6 deletions

diff --git a/ethosu/vela/graph_optimiser.py b/ethosu/vela/graph_optimiser.py
index f1b2d35c..ab4d916e 100644
--- a/ethosu/vela/graph_optimiser.py
+++ b/ethosu/vela/graph_optimiser.py
@@ -59,7 +59,7 @@ def remove_passthrough_tensor(tens, arch, nng):
     return tens
 
 
-def rewrite_concat_ops(op, arch, nng):
+def rewrite_concat_ops(op, arch):
     if not op.run_on_npu or not op.type.is_concat_op():
         return op
 
@@ -283,8 +283,8 @@ def convert_resizebilinear_to_2x2_pool(op):
         op.attrs["padding"] = Padding.SAME
     op.inputs[0].resampling_mode = resampling_mode.NEAREST
 
-    upscaled_shape = op.ifm_shape[0].get_hw_as_list()
-    out_shape = op.ofm_shape[0].get_hw_as_list()
+    upscaled_shape = np.array(op.ifm_shapes[0].get_hw_as_list())
+    out_shape = np.array(op.ofm_shapes[0].get_hw_as_list())
     if (upscaled_shape == upscaled_shape * 2 - shape_modifier).all():
         return op
 
@@ -346,6 +346,20 @@ def convert_nop_split_to_identity(op, arch, nng):
     return op
 
 
+def rewrite_fully_connected_input(op, arch, nng):
+    if op.type == Op.FullyConnected:
+        n_in_elems = op.weights.shape[-2]
+        elms = op.ifm.elements()
+        batch_size = elms // n_in_elems
+        assert batch_size * n_in_elems == elms
+
+        if op.ifm.shape != [batch_size, n_in_elems]:
+            op.ifm.avoid_NHCWB16 = True
+
+        op.ifm_shapes[0] = Shape4D([batch_size, 1, 1, n_in_elems])
+    return op
+
+
 def convert_batched_fc_shape(op, arch, nng):
     if op.type == Op.FullyConnected:
         # Check if the first dimension indicates batching
@@ -1199,9 +1213,8 @@ def optimise_graph_a(nng, arch, verbose_graph=False):
     # Handle Concat Ops
     for idx, sg in enumerate(nng.subgraphs):
         # rewrite graph pass
-        nng.subgraphs[idx] = rewrite_graph.rewrite_graph_pre_order(
-            nng, sg, arch, [], [rewrite_concat_ops], rewrite_unsupported=False,
-        )
+        rewrite_graph.visit_graph_post_order(sg.output_tensors, arch, [], [rewrite_concat_ops])
+        sg.refresh_after_modification()
 
     # Handle Split Ops
     for idx, sg in enumerate(nng.subgraphs):
@@ -1232,6 +1245,7 @@ def optimise_graph_a(nng, arch, verbose_graph=False):
         convert_conv_to_fc,
         convert_softmax,
         optimise_strided_conv,
+        rewrite_fully_connected_input,
         convert_batched_fc_shape,
         fixup_conv2d_backprop,
         fixup_relus_with_differing_ifm_ofm_scaling,