3 files changed, 43 insertions, 19 deletions
diff --git a/candle-core/src/backprop.rs b/candle-core/src/backprop.rs
index 26d73ea1..35619015 100644
--- a/candle-core/src/backprop.rs
+++ b/candle-core/src/backprop.rs
@@ -250,6 +250,7 @@ impl Tensor {
                             out_padding,
                             *stride,
                             *dilation,
+                            /* groups */ 1,
                         )?;
                         let sum_grad = grads.or_insert(arg)?;
                         *sum_grad = sum_grad.add(&grad_arg)?;
diff --git a/candle-core/src/conv.rs b/candle-core/src/conv.rs
index fe923087..7b3922dd 100644
--- a/candle-core/src/conv.rs
+++ b/candle-core/src/conv.rs
@@ -187,6 +187,29 @@ impl Tensor {
         }
     }
 
+    fn conv_transpose1d_single_group(
+        &self,
+        kernel: &Self,
+        params: &ParamsConvTranspose1D,
+    ) -> Result<Self> {
+        let storage = self.storage().conv_transpose1d(
+            self.layout(),
+            &kernel.storage(),
+            kernel.layout(),
+            params,
+        )?;
+        let op = BackpropOp::new2(self, kernel, |arg, kernel| Op::ConvTranspose1D {
+            arg,
+            kernel,
+            padding: params.padding,
+            output_padding: params.output_padding,
+            stride: params.stride,
+            dilation: params.dilation,
+        });
+        let out_dims = params.out_dims();
+        Ok(crate::tensor::from_storage(storage, out_dims, op, false))
+    }
+
     /// Applies a 1D transposed convolution over the input tensor.
     pub fn conv_transpose1d(
         &self,
@@ -195,39 +218,39 @@ impl Tensor {
         output_padding: usize,
         stride: usize,
         dilation: usize,
+        groups: usize,
     ) -> Result<Self> {
-        let (b_size, c_in, l_in) = self.dims3()?;
         let (c_in_k, c_out, k_size) = kernel.dims3()?;
+        let (b_size, c_in, l_in) = self.dims3()?;
         if c_in != c_in_k {
             crate::bail!("in_channel mismatch between input ({c_in}) and kernel ({c_in_k})")
         }
+        if c_in % groups != 0 {
+            crate::bail!("in_channel {c_in} is not divisible by the number of groups")
+        }
         let params = ParamsConvTranspose1D {
             b_size,
             l_in,
             k_size,
             c_out,
-            c_in,
+            c_in: c_in / groups,
             padding,
             output_padding,
             stride,
             dilation,
         };
-        let storage = self.storage().conv_transpose1d(
-            self.layout(),
-            &kernel.storage(),
-            kernel.layout(),
-            &params,
-        )?;
-        let op = BackpropOp::new2(self, kernel, |arg, kernel| Op::ConvTranspose1D {
-            arg,
-            kernel,
-            padding: params.padding,
-            output_padding: params.output_padding,
-            stride: params.stride,
-            dilation: params.dilation,
-        });
-        let out_dims = params.out_dims();
-        Ok(crate::tensor::from_storage(storage, out_dims, op, false))
+        if groups == 1 {
+            self.conv_transpose1d_single_group(kernel, &params)
+        } else {
+            let blocks = self.chunk(groups, 1)?;
+            let kernel = kernel.chunk(groups, 0)?;
+            let blocks = blocks
+                .iter()
+                .zip(&kernel)
+                .map(|(block, kernel)| block.conv_transpose1d_single_group(kernel, &params))
+                .collect::<Result<Vec<_>>>()?;
+            Tensor::cat(&blocks, 1)
+        }
     }
 
     fn conv2d_single_group(&self, kernel: &Self, params: &ParamsConv2D) -> Result<Self> {
diff --git a/candle-core/tests/conv_tests.rs b/candle-core/tests/conv_tests.rs
index 5bbd903d..211a1fe0 100644
--- a/candle-core/tests/conv_tests.rs
+++ b/candle-core/tests/conv_tests.rs
@@ -50,7 +50,7 @@ fn conv1d(dev: &Device) -> Result<()> {
         test_utils::to_vec1_round(&res.flatten_all()?, 4)?,
         [2.4509, 2.6357, -1.3336, 4.1393, 0.5657, 1.8091, -1.1784, 3.5675, 0.5069, 3.3352]
     );
-    let res = t.conv_transpose1d(&w.transpose(0, 1)?, 0, 0, 1, 1)?;
+    let res = t.conv_transpose1d(&w.transpose(0, 1)?, 0, 0, 1, 1, 1)?;
     assert_eq!(res.dims(), [1, 2, 7]);
     assert_eq!(
         test_utils::to_vec1_round(&res.flatten_all()?, 4)?,