diff --git a/datasets/flwr_datasets/partitioner/vertical_size_partitioner.py b/datasets/flwr_datasets/partitioner/vertical_size_partitioner.py
index 462a76a2e3f5..6326af0a0ea6 100644
--- a/datasets/flwr_datasets/partitioner/vertical_size_partitioner.py
+++ b/datasets/flwr_datasets/partitioner/vertical_size_partitioner.py
@@ -51,7 +51,7 @@ class VerticalSizePartitioner(Partitioner):
         toward the partition sizes.
         In case fo list[int]: sum(partition_sizes) == len(columns) - len(drop_columns) -
         len(shared_columns)  - len(active_party_columns)
-    active_party_column : Optional[Union[str, list[str]]]
+    active_party_columns : Optional[Union[str, list[str]]]
         Column(s) (typically representing labels) associated with the
         "active party" (which can be the server).
     active_party_columns_mode : Union[Literal[["add_to_first", "add_to_last", "create_as_first", "create_as_last", "add_to_all"], int]
@@ -93,7 +93,7 @@ class VerticalSizePartitioner(Partitioner):
     def __init__(
         self,
         partition_sizes: Union[list[int], list[float]],
-        active_party_column: Optional[Union[str, list[str]]] = None,
+        active_party_columns: Optional[Union[str, list[str]]] = None,
         active_party_columns_mode: Union[
             Literal[
                 "add_to_first",
@@ -112,7 +112,7 @@ def __init__(
         super().__init__()
 
         self._partition_sizes = partition_sizes
-        self._active_party_columns = self._init_active_party_column(active_party_column)
+        self._active_party_columns = _init_active_party_columns(active_party_columns)
         self._active_party_columns_mode = active_party_columns_mode
         self._drop_columns = drop_columns or []
         self._shared_columns = shared_columns or []
@@ -201,8 +201,17 @@ def _validate_parameters_in_init(self) -> None:
             raise ValueError("partition_sizes must be a list.")
         if all(isinstance(fraction, float) for fraction in self._partition_sizes):
             fraction_sum = sum(self._partition_sizes)
+            # Tolerance 0.01 for the floating point numerical problems
+            if fraction_sum < 1.01 and fraction_sum > 0.99:
+                self._partition_sizes = self._partition_sizes[:-1] + [
+                    1.0 - self._partition_sizes[-1]
+                ]
+                fraction_sum = 1.0
             if fraction_sum != 1.0:
-                raise ValueError("Float ratios in `partition_sizes` must sum to 1.0.")
+                raise ValueError(
+                    "Float ratios in `partition_sizes` must sum to 1.0. "
+                    f"Instead got: {fraction_sum}."
+                )
             if any(
                 fraction < 0.0 or fraction > 1.0 for fraction in self._partition_sizes
             ):
@@ -276,16 +285,17 @@ def _validate_parameters_while_partitioning(
                     "active_party_columns are not included in the division."
                 )
 
-    def _init_active_party_column(
-        self, active_party_column: Optional[Union[str, list[str]]]
-    ) -> list[str]:
-        if active_party_column is None:
-            return []
-        if isinstance(active_party_column, str):
-            return [active_party_column]
-        if isinstance(active_party_column, list):
-            return active_party_column
-        raise ValueError("active_party_column must be a string or a list of strings.")
+
+def _init_active_party_columns(
+    active_party_column: Optional[Union[str, list[str]]]
+) -> list[str]:
+    if active_party_column is None:
+        return []
+    if isinstance(active_party_column, str):
+        return [active_party_column]
+    if isinstance(active_party_column, list):
+        return active_party_column
+    raise ValueError("active_party_column must be a string or a list of strings.")
 
 
 def _count_split(columns: list[str], counts: list[int]) -> list[list[str]]: