fix docstring and add more test cases for multiplier

generative/networks/blocks/encoder_modules.py

@@ -30,8 +30,8 @@ class SpatialRescaler(nn.Module):
         n_stages: number of interpolation stages.
         size: output spatial size (int or Tuple[int] or Tuple[int, int] or Tuple[int, int, int]).
         method: algorithm used for sampling.
-        multiplier: multiplier for spatial size. If scale_factor is a tuple,
-            its length has to match the number of spatial dimensions.
+        multiplier: multiplier for spatial size. If `multiplier` is a sequence,
+            its length has to match the number of spatial dimensions; `input.dim() - 2`.
         in_channels: number of input channels.
         out_channels: number of output channels.
         bias: whether to have a bias term.
@@ -43,7 +43,7 @@ def __init__(
         n_stages: int = 1,
         size: Sequence[int] | int | None = None,
         method: str = "bilinear",
-        multiplier: float | None = None,
+        multiplier: Sequence[float] | float | None = None,
         in_channels: int = 3,
         out_channels: int = None,
         bias: bool = False,

tests/test_encoder_modules.py

@@ -69,6 +69,18 @@
         (1, 3, 16, 16, 16),
         (1, 2, 8, 8, 8),
     ],
+    [
+        {
+            "spatial_dims": 3,
+            "n_stages": 1,
+            "method": "trilinear",
+            "multiplier": (0.25, 0.5, 0.75),
+            "in_channels": 3,
+            "out_channels": 2,
+        },
+        (1, 3, 20, 20, 20),
+        (1, 2, 5, 10, 15),
+    ],
     [
         {"spatial_dims": 2, "n_stages": 1, "size": (8, 8), "method": "bilinear", "in_channels": 3, "out_channels": 2},
         (1, 3, 16, 16),