[Bug]: Transformations Printing

[giorgossideris]

Describe the bug

The MessageTokenLimiter prints the number of tokens truncated, while the MessageHistoryLimiter doesn't print the number of messages removed. Also, the TransformMessages._print_stats method isn't working.

Steps to reproduce

Execute the following code:

from autogen.agentchat.contrib.capabilities import transform_messages, transforms

messages = [
    {"role": "user", "content": "hello"},
    {"role": "assistant", "content": [{"type": "text", "text": "there"}]},
    {"role": "user", "content": "how"},
    {"role": "assistant", "content": [{"type": "text", "text": "are you doing?"}]},
    {"role": "user", "content": "very very very very very very long string"},
]


context_handling = transform_messages.TransformMessages(
    transforms=[
        transforms.MessageHistoryLimiter(max_messages=3),
        transforms.MessageTokenLimiter(max_tokens=1000, max_tokens_per_message=3),
    ],
)

context_handling._transform_messages(messages)

(code based on #2247)

Model Used

No model used

Expected Behavior

To print the stats for all transformations, or not at all.

Screenshots and logs

No response

Additional Information

The TransformMessages._print_stats problem is caused by the fact that: if pre_transform_messages_len < post_transform_messages_len: should be if post_transform_messages_len < pre_transform_messages_len:

[giorgossideris]

I will open a PR soon.