Completed InternLM2 adapter (#1251)

Author: jlarson4

tests/unit/model_bridge/supported_architectures/test_internlm2_adapter.py

@@ -25,6 +25,7 @@
     GraniteMoeArchitectureAdapter,
     GraniteMoeHybridArchitectureAdapter,
     HubertArchitectureAdapter,
+    InternLM2ArchitectureAdapter,
     LlamaArchitectureAdapter,
     LlavaArchitectureAdapter,
     LlavaNextArchitectureAdapter,
@@ -79,6 +80,7 @@
     "GPTJForCausalLM": GptjArchitectureAdapter,
     "HubertForCTC": HubertArchitectureAdapter,
     "HubertModel": HubertArchitectureAdapter,
+    "InternLM2ForCausalLM": InternLM2ArchitectureAdapter,
     "LlamaForCausalLM": LlamaArchitectureAdapter,
     "LlavaForConditionalGeneration": LlavaArchitectureAdapter,
     "LlavaNextForConditionalGeneration": LlavaNextArchitectureAdapter,

transformer_lens/factories/architecture_adapter_factory.py

@@ -0,0 +1,44 @@
+"""Compatibility shims for transformers version differences.
+
+These patches are applied lazily (only when missing) so they're safe to call
+from multiple adapters — the first caller wins, subsequent calls are no-ops.
+"""
+
+
+def patch_dynamic_cache_v5() -> None:
+    """Backfill DynamicCache methods removed in transformers v5.
+
+    Remote-code models written for transformers v4 call from_legacy_cache,
+    to_legacy_cache, and get_usable_length which were removed in v5.
+    Call this from any adapter's prepare_loading() that needs them.
+    """
+    try:
+        from transformers.cache_utils import DynamicCache
+    except Exception:
+        return
+
+    if not hasattr(DynamicCache, "from_legacy_cache"):
+
+        @classmethod  # type: ignore[misc]
+        def _from_legacy_cache(cls, past_key_values=None):  # type: ignore[no-untyped-def]
+            cache = cls()
+            if past_key_values is not None:
+                for idx, layer_past in enumerate(past_key_values):
+                    cache.update(layer_past[0], layer_past[1], idx)
+            return cache
+
+        DynamicCache.from_legacy_cache = _from_legacy_cache  # type: ignore[attr-defined]
+
+    if not hasattr(DynamicCache, "get_usable_length"):
+
+        def _get_usable_length(self, new_seq_len: int = 0, layer_idx: int = 0) -> int:  # type: ignore[no-untyped-def]
+            return self.get_seq_length(layer_idx)
+
+        DynamicCache.get_usable_length = _get_usable_length  # type: ignore[attr-defined]
+
+    if not hasattr(DynamicCache, "to_legacy_cache"):
+
+        def _to_legacy_cache(self):  # type: ignore[no-untyped-def]
+            return tuple((layer.keys, layer.values) for layer in self.layers)
+
+        DynamicCache.to_legacy_cache = _to_legacy_cache  # type: ignore[attr-defined]

transformer_lens/model_bridge/compat.py

@@ -60,6 +60,9 @@
 from transformer_lens.model_bridge.supported_architectures.hubert import (
     HubertArchitectureAdapter,
 )
+from transformer_lens.model_bridge.supported_architectures.internlm2 import (
+    InternLM2ArchitectureAdapter,
+)
 from transformer_lens.model_bridge.supported_architectures.llama import (
     LlamaArchitectureAdapter,
 )
@@ -171,6 +174,7 @@
     "Gpt2LmHeadCustomArchitectureAdapter",
     "GptjArchitectureAdapter",
     "HubertArchitectureAdapter",
+    "InternLM2ArchitectureAdapter",
     "LlamaArchitectureAdapter",
     "LlavaArchitectureAdapter",
     "LlavaNextArchitectureAdapter",