Update block.py

src/petals/bloom/block.py

@@ -5,13 +5,15 @@ See commit history for authorship.
 """
 import os
 from typing import Optional, Tuple
+from packaging import version
 
 import torch.nn.quantized.dynamic.modules.linear
 import transformers
 from transformers.models.bloom.modeling_bloom import BloomBlock, _expand_mask, _make_causal_mask, build_alibi_tensor
 
 if not os.getenv("PETALS_IGNORE_DEPENDENCY_VERSION"):
-    assert transformers.__version__.startswith("4.26."), "Please install transformers 4.26.1"
+    assert version.parse("4.26.0") < version.parse(transformers.__version__) < version.parse("5.0.0"), \
+        "Please install transformers >=4.26.0,<5.0.0"
 
 
 class WrappedBloomBlock(BloomBlock):