From 27ed6d0ba5220f53b4e19c35c617b044168f7ea8 Mon Sep 17 00:00:00 2001
From: lucidrains <lucidrains@gmail.com>
Date: Sun, 19 Oct 2025 09:16:06 -0700
Subject: [PATCH] fix time kv cache

---
 dreamer4/dreamer4.py | 24 ++++++++++++++++++++----
 pyproject.toml       |  2 +-
 2 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/dreamer4/dreamer4.py b/dreamer4/dreamer4.py
index f0dc400..dca0796 100644
--- a/dreamer4/dreamer4.py
+++ b/dreamer4/dreamer4.py
@@ -80,6 +80,7 @@ class Experience:
     step_size: int | None = None
     agent_index: int = 0
     is_from_world_model: bool = True
+    is_batched: bool = True
 
 # helpers
 
@@ -1312,9 +1313,19 @@ class AxialSpaceTimeTransformer(Module):
 
             layer_rotary_pos_emb = rotary_pos_emb if layer_is_time else None
 
+            # maybe past kv cache
+
+            maybe_kv_cache = next(iter_kv_cache, None) if layer_is_time else None
+
             # attention layer
 
-            tokens, kv_cache = attn(tokens, rotary_pos_emb = layer_rotary_pos_emb, attend_fn = attend_fn, kv_cache = next(iter_kv_cache, None), return_kv_cache = True)
+            tokens, next_kv_cache = attn(
+                tokens,
+                rotary_pos_emb = layer_rotary_pos_emb,
+                attend_fn = attend_fn,
+                kv_cache = maybe_kv_cache,
+                return_kv_cache = True
+            )
 
             tokens = post_attn_rearrange(tokens)
 
@@ -1325,7 +1336,7 @@ class AxialSpaceTimeTransformer(Module):
             # save kv cache if is time layer
 
             if layer_is_time:
-                time_attn_kv_caches.append(kv_cache)
+                time_attn_kv_caches.append(next_kv_cache)
 
         tokens = self.reduce_streams(tokens)
 
@@ -2624,7 +2635,12 @@ class DynamicsWorldModel(Module):
 class Dreamer(Module):
     def __init__(
         self,
-        video_tokenizer: VideoTokenizer,
-        dynamics_model: DynamicsWorldModel,
+        state_tokenizer: VideoTokenizer,
+        world_model: DynamicsWorldModel,
     ):
         super().__init__()
+        self.state_toke = state_tokenizer
+        self.world_model = world_model
+
+    def interact_with_sim(self, env) -> Experience:
+        raise NotImplementedError
diff --git a/pyproject.toml b/pyproject.toml
index 77dd976..094eab5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "dreamer4"
-version = "0.0.44"
+version = "0.0.45"
 description = "Dreamer 4"
 authors = [
     { name = "Phil Wang", email = "lucidrains@gmail.com" }