Pull Request Overview

This PR addresses bug fixes in the meta inference implementations and the unfold operator by introducing a fallback mechanism for symbolic variables and correcting incorrect arithmetic in the unfold infermeta. Key changes include:

• Updating the error handling in paddle.nn.functional.unfold to use a more specific exception.
• Refactoring the symbolic meta inference flow in the function graph executor to include a fallback to constant symbolic variables.
• Fixing the computation of output channels in the unfold infermeta logic when the channel dimension is negative.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

                            f"InferMeta encount {type(err)}, but all args are not symbolic."

                            f"InferMeta encount {type(err)}, but all args are not symbolic."

      in_dims[1] < 0 ? -1 : static_cast<int>(in_dims[1] * kernel_sizes[0] * kernel_sizes[1]);