added paddle.sum frontend and test for it

ivy/functional/frontends/paddle/tensor/math.py

@@ -476,6 +476,17 @@ def subtract(x, y, name=None):
     return ivy.subtract(x, y)
 
 
+@with_supported_dtypes(
+    {"2.5.1 and below": ("bool", "int32", "int64", "float32", "float64")}, "paddle"
+)
+@to_ivy_arrays_and_back
+def sum(x, axis=None, keepdim=False, name=None):
+    if x.dtype == ivy.int32:
+        arr = ivy.sum(x)
+        return arr.astype(ivy.int64)
+    return ivy.sum(x)
+
+
 @with_supported_dtypes(
     {"2.5.1 and below": ("float32", "float64", "int32", "int6")}, "paddle"
 )

ivy_tests/test_ivy/test_frontends/test_paddle/test_tensor/test_math.py

@@ -2100,6 +2100,35 @@ def test_paddle_subtract(
     )
 
 
+# sum
+@handle_frontend_test(
+    fn_tree="paddle.sum",
+    dtype_and_x=helpers.dtype_and_values(
+        available_dtypes=helpers.get_dtypes("valid"),
+        num_arrays=1,
+    ),
+)
+def test_paddle_sum(
+    *,
+    dtype_and_x,
+    on_device,
+    fn_tree,
+    frontend,
+    backend_fw,
+    test_flags,
+):
+    input_dtype, x = dtype_and_x
+    helpers.test_frontend_function(
+        input_dtypes=input_dtype,
+        backend_to_test=backend_fw,
+        frontend=frontend,
+        fn_tree=fn_tree,
+        test_flags=test_flags,
+        on_device=on_device,
+        x=x[0],
+    )
+
+
 # take
 @handle_frontend_test(
     fn_tree="paddle.take", dtype_and_values=_test_paddle_take_helper()