Feat (core): quant scale support

src/brevitas/core/quant/int.py

@@ -8,6 +8,7 @@
 from torch.nn import Module
 
 import brevitas
+from brevitas.core.function_wrapper.misc import Identity
 from brevitas.core.quant.delay import DelayWrapper
 from brevitas.core.utils import StatelessBuffer
 from brevitas.function.ops_ste import round_ste
@@ -138,13 +139,18 @@ def __init__(
             scaling_impl: Module,
             int_scaling_impl: Module,
             zero_point_impl: Module,
-            bit_width_impl: Module):
+            bit_width_impl: Module,
+            scaling_int_quant: Optional[Module] = None):
         super(RescalingIntQuant, self).__init__()
         self.int_quant = int_quant
         self.scaling_impl = scaling_impl
         self.int_scaling_impl = int_scaling_impl
         self.zero_point_impl = zero_point_impl
         self.msb_clamp_bit_width_impl = bit_width_impl
+        if scaling_int_quant is None:
+            self.scaling_int_quant = Identity()
+        else:
+            self.scaling_int_quant = scaling_int_quant
 
     @brevitas.jit.script_method
     def forward(self, x: Tensor) -> Tuple[Tensor, Tensor, Tensor, Tensor]:

src/brevitas/core/restrict_val.py

@@ -179,3 +179,30 @@ def forward(self, x: torch.Tensor):
         x = self.float_to_int_impl(x)
         x = self.power_of_two(x)
         return x
+
+
+class QuantRestrictValue(brevitas.jit.ScriptModule):
+
+    def __init__(self, restrict_value_float_to_int_impl: Module):
+        super(QuantRestrictValue, self).__init__()
+        self.float_to_int_impl = restrict_value_float_to_int_impl
+
+    def restrict_init_float(self, x: float):
+        return Identity()
+
+    def restrict_init_tensor(self, x: torch.Tensor):
+        return Identity()
+
+    def restrict_init_module(self):
+        return Identity()
+
+    def restrict_init_inplace_module(self):
+        return Identity()
+
+    def retrocompatibility_op(self, x):
+        return Identity()
+
+    @brevitas.jit.script_method
+    def forward(self, x: torch.Tensor):
+        o, *_ = self.float_to_int_impl(x)
+        return o

src/brevitas/core/scaling/quant.py

@@ -0,0 +1,12 @@
+import torch.nn as nn
+
+class QuantScaling(nn.Module):
+    def __init__(self, scale_rescaling_int_quant) -> None:
+        super().__init__()
+        self.scale_rescaling_int_quant = scale_rescaling_int_quant
+
+    def forward(self, x):
+        _,scale, *_ = self.scale_rescaling_int_quant(x)
+        # print(x.shape, scale.shape)
+        print(x, scale)
+        return x * scale