more globalencoder followup

Summary: remove n_instances==0 special case, standardise args for GlobalEncoderBase's forward.

Reviewed By: shapovalov

Differential Revision: D37817340

fbshipit-source-id: 0aac5fbc7c336d09be9d412cffff5712bda27290

projects/implicitron_trainer/tests/experiment.yaml

@@ -187,7 +187,7 @@ model_factory_ImplicitronModelFactory_args:
     global_encoder_SequenceAutodecoder_args:
       autodecoder_args:
         encoding_dim: 0
-        n_instances: 0
+        n_instances: 1
         init_scale: 1.0
         ignore_input: false
     raysampler_AdaptiveRaySampler_args:

pytorch3d/implicitron/models/global_encoder/autodecoder.py

@@ -24,15 +24,16 @@ class Autodecoder(Configurable, torch.nn.Module):
     """
 
     encoding_dim: int = 0
-    n_instances: int = 0
+    n_instances: int = 1
     init_scale: float = 1.0
     ignore_input: bool = False
 
     def __post_init__(self):
         super().__init__()
+
         if self.n_instances <= 0:
-            # Do not init the codes at all in case we have 0 instances.
-            return
+            raise ValueError(f"Invalid n_instances {self.n_instances}")
+
         self._autodecoder_codes = torch.nn.Embedding(
             self.n_instances,
             self.encoding_dim,
@@ -70,13 +71,9 @@ class Autodecoder(Configurable, torch.nn.Module):
         return key_map
 
     def calculate_squared_encoding_norm(self) -> Optional[torch.Tensor]:
-        if self.n_instances <= 0:
-            return None
         return (self._autodecoder_codes.weight**2).mean()  # pyre-ignore[16]
 
     def get_encoding_dim(self) -> int:
-        if self.n_instances <= 0:
-            return 0
         return self.encoding_dim
 
     def forward(self, x: Union[torch.LongTensor, List[str]]) -> Optional[torch.Tensor]:
@@ -90,9 +87,6 @@ class Autodecoder(Configurable, torch.nn.Module):
             codes: A tensor of shape `(N, self.encoding_dim)` containing the
                 key-specific autodecoder codes.
         """
-        if self.n_instances == 0:
-            return None
-
         if self.ignore_input:
             x = ["singleton"]
 

pytorch3d/implicitron/models/global_encoder/global_encoder.py

@@ -42,7 +42,13 @@ class GlobalEncoderBase(ReplaceableBase):
         """
         raise NotImplementedError()
 
-    def forward(self, **kwargs) -> torch.Tensor:
+    def forward(
+        self,
+        *,
+        frame_timestamp: Optional[torch.Tensor] = None,
+        sequence_name: Optional[Union[torch.LongTensor, List[str]]] = None,
+        **kwargs,
+    ) -> torch.Tensor:
         """
         Given a set of inputs to encode, generates a tensor containing the encoding.
 
@@ -70,9 +76,14 @@ class SequenceAutodecoder(GlobalEncoderBase, torch.nn.Module):  # pyre-ignore: 1
         return self.autodecoder.get_encoding_dim()
 
     def forward(
-        self, sequence_name: Union[torch.LongTensor, List[str]], **kwargs
+        self,
+        *,
+        frame_timestamp: Optional[torch.Tensor] = None,
+        sequence_name: Optional[Union[torch.LongTensor, List[str]]] = None,
+        **kwargs,
     ) -> torch.Tensor:
-
+        if sequence_name is None:
+            raise ValueError("sequence_name must be provided.")
         # run dtype checks and pass sequence_name to self.autodecoder
         return self.autodecoder(sequence_name)
 
@@ -101,7 +112,15 @@ class HarmonicTimeEncoder(GlobalEncoderBase, torch.nn.Module):
     def get_encoding_dim(self):
         return self._harmonic_embedding.get_output_dim(1)
 
-    def forward(self, frame_timestamp: torch.Tensor, **kwargs) -> torch.Tensor:
+    def forward(
+        self,
+        *,
+        frame_timestamp: Optional[torch.Tensor] = None,
+        sequence_name: Optional[Union[torch.LongTensor, List[str]]] = None,
+        **kwargs,
+    ) -> torch.Tensor:
+        if frame_timestamp is None:
+            raise ValueError("frame_timestamp must be provided.")
         if frame_timestamp.shape[-1] != 1:
             raise ValueError("Frame timestamp's last dimensions should be one.")
         time = frame_timestamp / self.time_divisor

tests/implicitron/data/overrides.yaml

@@ -52,7 +52,7 @@ loss_weights:
 global_encoder_SequenceAutodecoder_args:
   autodecoder_args:
     encoding_dim: 0
-    n_instances: 0
+    n_instances: 1
     init_scale: 1.0
     ignore_input: false
 raysampler_AdaptiveRaySampler_args: