Adding support and testing for chunk tensor operation (#90)

* Add support and test for chunk tensor op

* Fix for chunk tensor op

---------

Co-authored-by: SarahByrneIntel <sarahbyrne@intel.com>

intel_npu_acceleration_library/backend/tensor.py

@@ -899,6 +899,43 @@ def sum(
             sum = sum.to(dtype)
         return sum
 
+    def chunk(
+        self,
+        chunks: int,
+        dim: int = 0,
+    ) -> Union["Tensor", list]:
+        """
+        Return the list of tensor chunks.
+
+        Args:
+            chunks (int): The number of chunks to return.
+            dim (int): The dimension along which to split the tensor. Default is 0.
+
+        Returns:
+            Union["Tensor", list]: The resulting list of split tensors or a single tensor.
+
+        Raises:
+            ValueError: The input chunks value is not valid.
+        """
+        if chunks <= 0:
+            raise ValueError("The input chunks value is not valid.")
+        if chunks == 1:
+            return self
+        tensors = []
+        remainder = self.shape[dim] % chunks
+        chunk_size = self.shape[dim] // chunks + (1 if remainder > 0 else 0)
+        num_dims = self.dim()
+
+        start_idx = 0
+        for _ in range(chunks):
+            indexes = [slice(None)] * num_dims
+            end_idx = start_idx + chunk_size
+            end_idx = end_idx if end_idx < self.shape[dim] else self.shape[dim]
+            indexes[dim] = slice(start_idx, end_idx)
+            tensors.append(self.__getitem__(tuple(indexes)))
+            start_idx = end_idx
+        return tensors
+
     def to(self, dtype: NPUDtype) -> "Tensor":
         """
         Convert the tensor to the specified data type.

test/python/test_tensor.py

@@ -270,7 +270,6 @@ def test_reduce_operations(batch, hidden_dim, axis, op):
             reference = eval(f"X.{op}(dim=axis)")
     reference = reference.numpy()
 
-    print(X.sum())
     model = NNFactory()
     t1 = model.parameter(X.shape)
     _ = eval(f"t1.{op}()") if axis is None else eval(f"t1.{op}(dim=axis)")
@@ -326,3 +325,37 @@ def act(a, b):
         )
         < 0.001
     )
+
+
+@pytest.mark.parametrize("batch", [16, 128])
+@pytest.mark.parametrize("hidden_dim", [256, 512])
+@pytest.mark.parametrize("chunks", [1, 2, 3, 4])
+@pytest.mark.parametrize("axis", [0, 1, -1, -2])
+def test_chunk_operation(batch, hidden_dim, chunks, axis):
+
+    X = torch.rand((batch, hidden_dim)).to(torch.float16)
+
+    reference = X.chunk(chunks=chunks, dim=axis)
+
+    model = NNFactory()
+    t1 = model.parameter(X.shape)
+    _ = t1.chunk(chunks=chunks, dim=axis)
+    model.compile()
+
+    result = model(X)
+
+    if chunks == 1:
+        assert np.isfinite(
+            reference[0].numpy()
+        ).all(), "Pytorch Reference contains NaN or Inf"
+        assert np.isfinite(result.numpy()).all(), "NPU output contains NaN or Inf"
+        assert 1 - r2_score(reference[0].numpy(), result.numpy()) < 0.01
+    else:
+        for i in range(len(reference)):
+            assert np.isfinite(
+                reference[i].numpy()
+            ).all(), "Pytorch Reference contains NaN or Inf"
+            assert np.isfinite(
+                result[i].numpy()
+            ).all(), "NPU output contains NaN or Inf"
+            assert 1 - r2_score(reference[i].numpy(), result[i].numpy()) < 0.01