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Add ContextLengthExceededError and validator #427

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Add ContextLengthExceededError and validator #427

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19 changes: 19 additions & 0 deletions common/errors.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,19 @@
class ContextLengthExceededError(Exception):
pass

def validate_context_requirements(
context_len: int,
max_seq_len: int,
max_tokens: int,
cache_max_num_tokens: int = None,
max_rq_tokens: int = None,
allocation_boundary: int = None,
):
if context_len > max_seq_len:
raise ContextLengthExceededError(
f"Prompt length {context_len} is greater than max_seq_len {max_seq_len}"
)
if cache_max_num_tokens is not None and context_len + max_tokens > cache_max_num_tokens:
raise ContextLengthExceededError(
f"Prompt length {context_len} + max_tokens {max_tokens} is greater than cache size {cache_max_num_tokens}"
)