use offload inference on InvariantPointAttention

fastfold/model/hub/alphafold.py

@@ -393,48 +393,40 @@ class AlphaFold(nn.Module):
             
         torch.cuda.empty_cache()
 
-        if no_iter == 3:
         outputs["msa"] = m[..., :n_seq, :, :]
         outputs["pair"] = z
         outputs["single"] = s
 
+        del z
+
         # Predict 3D structure
-        outputs_sm = self.structure_module(
-            s,
-            z,
+        outputs["sm"] = self.structure_module(
+            outputs,
             feats["aatype"],
             mask=feats["seq_mask"].to(dtype=s.dtype),
         )
         
         torch.cuda.empty_cache()
         
-        if no_iter == 3:
-            m_1_prev, z_prev, x_prev = None, None, None
-            outputs["sm"] = outputs_sm
         outputs["final_atom_positions"] = atom14_to_atom37(
             outputs["sm"]["positions"][-1], feats
         )
         outputs["final_atom_mask"] = feats["atom37_atom_exists"]
         outputs["final_affine_tensor"] = outputs["sm"]["frames"][-1]
-        else:
-            # Save embeddings for use during the next recycling iteration
         
         # [*, N, C_m]
         m_1_prev = m[..., 0, :, :]
 
         # [*, N, N, C_z]
-            z_prev = z
+        z_prev = outputs["pair"]
 
         # [*, N, 3]
-            x_prev = atom14_to_atom37(
-                outputs_sm["positions"][-1], feats
-            )
+        x_prev = outputs["final_atom_positions"]
+
 
-        if no_iter != 3:
-            return None,  m_1_prev, z_prev, x_prev
-        else:
         return outputs, m_1_prev, z_prev, x_prev
 
+
     def _disable_activation_checkpointing(self):
         self.template_embedder.template_pair_stack.blocks_per_ckpt = None
         self.evoformer.blocks_per_ckpt = None
@@ -537,6 +529,7 @@ class AlphaFold(nn.Module):
                 )
                 
                 if cycle_no != 3:
+                    del outputs
                     prevs = [m_1_prev, z_prev, x_prev]
                     del m_1_prev, z_prev, x_prev
 

fastfold/model/nn/structure_module.py

@@ -14,11 +14,13 @@
 # limitations under the License.
 
 import math
+import sys
 import torch
 import torch.nn as nn
 from typing import Any, Dict, Optional, Tuple, Union
 
-from fastfold.model.nn.primitives import Linear, LayerNorm, ipa_point_weights_init_
+from fastfold.model.nn.primitives import Linear, ipa_point_weights_init_
+from fastfold.model.fastnn.kernel import LayerNorm
 from fastfold.common.residue_constants import (
     restype_rigid_group_default_frame,
     restype_atom14_to_rigid_group,
@@ -292,6 +294,7 @@ class InvariantPointAttention(nn.Module):
         z: torch.Tensor,
         r: Union[Rigid, Rigid3Array],
         mask: torch.Tensor,
+        _offload_inference: bool = False,
     ) -> torch.Tensor:
         """
         Args:
@@ -380,7 +383,11 @@ class InvariantPointAttention(nn.Module):
         # Compute attention scores
         ##########################
         # [*, N_res, N_res, H]
-        b = self.linear_b(z)
+        b = self.linear_b(z[0])
+        
+        if(_offload_inference):
+            assert(sys.getrefcount(z[0]) == 2)
+            z[0] = z[0].cpu()
 
         # [*, H, N_res, N_res]
         a = torch.matmul(
@@ -508,14 +515,17 @@ class InvariantPointAttention(nn.Module):
             # [*, N_res, H * P_v, 3]
             o_pt = o_pt.reshape(*o_pt.shape[:-3], -1, 3)
 
+        if(_offload_inference):
+            z[0] = z[0].to(o_pt.device)
         # [*, N_res, H, C_z]
         o_pair = torch.matmul(a.transpose(-2, -3), z.to(dtype=a.dtype))
+        del a
 
         torch.cuda.empty_cache()
         
         # [*, N_res, H * C_z]
         o_pair = flatten_final_dims(o_pair, 2)
-        del a
+        torch.cuda.empty_cache()
 
         # [*, N_res, C_s]
         if self.is_multimer:
@@ -526,7 +536,7 @@ class InvariantPointAttention(nn.Module):
             s = self.linear_out(
                 torch.cat(
                     (o, *torch.unbind(o_pt, dim=-1), o_pt_norm, o_pair), dim=-1
-                ).to(dtype=z.dtype)
+                ).to(dtype=z[0].dtype)
             )
         torch.cuda.empty_cache()
 
@@ -737,8 +747,7 @@ class StructureModule(nn.Module):
 
     def _forward_monomer(
         self,
-        s: torch.Tensor,
-        z: torch.Tensor,
+        evoformer_output_dict,
         aatype: torch.Tensor,
         mask: Optional[torch.Tensor] = None,
     ) -> Dict[str, Any]:
@@ -755,6 +764,8 @@ class StructureModule(nn.Module):
         Returns:
             A dictionary of outputs
         """
+        s = evoformer_output_dict["single"]
+        
         if mask is None:
             # [*, N]
             mask = s.new_ones(s.shape[:-1])
@@ -765,9 +776,20 @@ class StructureModule(nn.Module):
         # [*, N, N, C_z]
         z = self.layer_norm_z(z)
         # inplace z
-        # z[0] = z[0].contiguous()
-        # torch.cuda.emtpy_cache()
-        # z[0] = self.layer_norm_z(z[0])
+        evoformer_output_dict["pair"] = evoformer_output_dict["pair"].contiguous()
+        torch.cuda.empty_cache()
+        z = self.layer_norm_z(evoformer_output_dict["pair"])
+        
+        # z = self.layer_norm_z(z)
+        _offload_inference = True
+        z_reference_list = None
+        if(_offload_inference):
+            assert(sys.getrefcount(evoformer_output_dict["pair"]) == 2)
+            evoformer_output_dict["pair"] = evoformer_output_dict["pair"].cpu()
+            z_reference_list = [z]
+            z = None
+
+        torch.cuda.empty_cache()
 
         # [*, N, C_s]
         s_initial = s
@@ -786,7 +808,8 @@ class StructureModule(nn.Module):
         outputs = []
         for i in range(self.no_blocks):
             # [*, N, C_s]
-            s = s + self.ipa(s, z, rigids, mask)
+             # inplace z
+            s = s + self.ipa(s, z_reference_list, rigids, mask, _offload_inference=_offload_inference)
             s = self.ipa_dropout(s)
             torch.cuda.empty_cache()
             s = self.layer_norm_ipa(s)
@@ -840,6 +863,11 @@ class StructureModule(nn.Module):
             if i < (self.no_blocks - 1):
                 rigids = rigids.stop_rot_gradient()
                 
+        del z, z_reference_list
+        if(_offload_inference):
+            evoformer_output_dict["pair"] = evoformer_output_dict["pair"].to(s.device)
+
+
         outputs = dict_multimap(torch.stack, outputs)
         outputs["single"] = s
 
@@ -847,8 +875,7 @@ class StructureModule(nn.Module):
 
     def _forward_multimer(
         self,
-        s: torch.Tensor,
-        z: torch.Tensor,
+        evoformer_output_dict,
         aatype: torch.Tensor,
         mask: Optional[torch.Tensor] = None,
     ) -> Dict[str, Any]:
@@ -916,8 +943,7 @@ class StructureModule(nn.Module):
 
     def forward(
         self,
-        s: torch.Tensor,
-        z: torch.Tensor,
+        evoformer_output_dict,
         aatype: torch.Tensor,
         mask: Optional[torch.Tensor] = None,
     ):
@@ -935,9 +961,9 @@ class StructureModule(nn.Module):
             A dictionary of outputs
         """
         if self.is_multimer:
-            outputs = self._forward_multimer(s, z, aatype, mask)
+            outputs = self._forward_multimer(evoformer_output_dict, aatype, mask)
         else:
-            outputs = self._forward_monomer(s, z, aatype, mask)
+            outputs = self._forward_monomer(evoformer_output_dict, aatype, mask)
 
         return outputs