[Quantized DeConv Support] Enable Quantized Transposed Convs with groups==1

backends/xnnpack/quantizer/xnnpack_quantizer.py

@@ -274,7 +274,7 @@ class XNNPACKQuantizer(Quantizer):
         QuantPattern("linear_relu", False, False, LINEAR_TARGETS),
         QuantPattern("linear", True, False, LINEAR_TARGETS),
         QuantPattern("conv", True, False, CONV_TARGETS),
-        QuantPattern("conv_transpose", False, False, CONV_TARGETS),
+        QuantPattern("conv_transpose", True, False, CONV_TARGETS),
         QuantPattern("conv_relu", False, False, CONV_TARGETS),
         QuantPattern("conv_transpose_relu", False, False, CONV_TARGETS),
         QuantPattern("adaptive_avg_pool2d", False, False, ADAPTIVE_AVG_POOL2D_TARGETS),

backends/xnnpack/quantizer/xnnpack_quantizer_utils.py

@@ -4,7 +4,10 @@
 
 import torch
 import torch.nn.functional as F
-from executorch.backends.xnnpack.utils.utils import is_depthwise_conv
+from executorch.backends.xnnpack.utils.utils import (
+    get_groups_from_conv,
+    is_depthwise_conv,
+)
 from torch._subclasses import FakeTensor
 from torch.fx import Node
 from torch.fx.passes.utils.matcher_with_name_node_map_utils import (
@@ -65,6 +68,28 @@ def decorator(annotator: AnnotatorType) -> None:
     return decorator
 
 
+def change_quantization_config(
+    original_qspec,
+    dtype=None,
+    quant_min=None,
+    quant_max=None,
+    qscheme=None,
+    ch_axis=None,
+    is_dynamic=None,
+    observer_or_fake_quant_ctr=None,
+):
+    return QuantizationSpec(
+        dtype=dtype or original_qspec.dtype,
+        quant_min=quant_min or original_qspec.quant_min,
+        quant_max=quant_max or original_qspec.quant_max,
+        qscheme=qscheme or original_qspec.qscheme,
+        ch_axis=ch_axis or original_qspec.ch_axis,
+        is_dynamic=is_dynamic or original_qspec.is_dynamic,
+        observer_or_fake_quant_ctr=observer_or_fake_quant_ctr
+        or original_qspec.observer_or_fake_quant_ctr,
+    )
+
+
 def is_relu_node(node: Node) -> bool:
     """
     Check if a given node is a relu node
@@ -231,31 +256,44 @@ def _do_annotate_conv(
             if is_relu_node(user):
                 continue
 
+        # Tracks conditions for whether or not to skip
+        skip = False
+
         input_qspec_map = {}
         input_act = conv_node.args[0]
         assert isinstance(input_act, Node)
         input_qspec_map[input_act] = get_input_act_qspec(quantization_config)
 
         weight = conv_node.args[1]
         assert isinstance(weight, Node)
-        input_qspec_map[weight] = get_weight_qspec(quantization_config)
+        weight_qspec = get_weight_qspec(quantization_config)
+        num_groups = get_groups_from_conv(conv_node)
 
-        # Only annotate dynamically quantized conv if it's 2D and not depthwise
-        if (
+        # skip if transposed conv has more than 1 group
+        skip = skip or (is_conv_transpose and num_groups != 1)
+        print(f"{skip} conv transpose and num_groups")
+
+        if is_conv_transpose:
+            # transposed convs per output channel quantization
+            weight_qspec = change_quantization_config(weight_qspec, ch_axis=1)
+
+        input_qspec_map[weight] = weight_qspec
+        is_dynamic = (
             quantization_config
             and quantization_config.input_activation
             and quantization_config.input_activation.is_dynamic
-        ):
+        )
+
+        # Only annotate dynamically quantized conv if it's 2D and not depthwise
+        if is_dynamic:
             weight_val = weight.meta.get("val", None)
             weight_shape = getattr(weight_val, "shape", None)
-
             # Skip if not a 4D weight tensor (i.e. not conv2d)
-            if weight_shape is not None and len(weight_shape) != 4:
-                continue
-
+            skip = skip or (weight_shape is not None and len(weight_shape) != 4)
             # Skip if depthwise (default to groups=1 since it's not an arg)
-            if is_depthwise_conv(weight_shape, 1, is_conv_transpose):
-                continue
+            skip = skip or (
+                not is_conv_transpose and is_depthwise_conv(weight_shape, 1, False)
+            )
 
         # adding weight node to the partition as well
         partition = [conv_node, conv_node.args[1]]
@@ -265,7 +303,7 @@ def _do_annotate_conv(
             input_qspec_map[bias] = get_bias_qspec(quantization_config)
             partition.append(bias)
 
-        if _is_annotated(partition):
+        if _is_annotated(partition) or skip:
             continue
 
         if filter_fn and any(not filter_fn(n) for n in partition):
@@ -311,7 +349,12 @@ def _do_annotate_conv_relu(
 
         weight = conv_node.args[1]
         assert isinstance(weight, Node)
-        input_qspec_map[weight] = get_weight_qspec(quantization_config)
+        weight_qspec = get_weight_qspec(quantization_config)
+        groups = get_groups_from_conv(conv_node)
+        if is_conv_transpose:
+            # transposed convs per output channel quantization
+            weight_qspec = change_quantization_config(weight_qspec, ch_axis=1)
+        input_qspec_map[weight] = weight_qspec
 
         # adding weight node to the partition as well
         partition = [relu_node, conv_node, conv_node.args[1]]
@@ -323,6 +366,9 @@ def _do_annotate_conv_relu(
         if _is_annotated(partition):
             continue
 
+        if is_conv_transpose and groups != 1:
+            continue
+
         if filter_fn and any(not filter_fn(n) for n in partition):
             continue