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Einsum error msg improvement (#2690)

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* Improved error message for Einsum

* Modifications via pre-commit

* format

* nits

---------

Co-authored-by: Awni Hannun <awni@apple.com>
This commit is contained in:
Manuel Villanueva
2025-10-27 08:31:47 -05:00
committed by GitHub
parent 8f8af61a37
commit 0cfeeb60ca
1 changed files with 15 additions and 3 deletions
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18
mlx/einsum.cpp
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@@ -671,7 +671,8 @@ std::pair<std::vector<PathNode>, PathInfo> einsum_path_helper(
}
int max_ellipsis_length = 0;
auto check_letters_and_expand_ellipsis = [&](auto& subscript,
const array* operand) {
const array* operand,
int operand_idx) {
bool have_ellipsis = false;
int cnt_before = 0, cnt_after = 0;
for (int i = 0; i < subscript.size(); i++) {
@@ -708,10 +709,21 @@ std::pair<std::vector<PathNode>, PathInfo> einsum_path_helper(
int ellipsis_length;
if (operand != nullptr) {
ellipsis_length = operand->ndim() - cnt_before - cnt_after;
if (ellipsis_length < 0) {
std::ostringstream msg;
msg << "[" << fn_name << "] Operand " << operand_idx << " with shape "
<< operand->shape()
<< " has insufficient dimensions for subscript '" << subscript
<< "'. The ellipsis requires at least "
<< (cnt_before + cnt_after) << " dimensions but the operand has "
<< operand->ndim() << " dimensions.";
throw std::invalid_argument(msg.str());
}
max_ellipsis_length = std::max(ellipsis_length, max_ellipsis_length);
} else {
ellipsis_length = max_ellipsis_length;
}
subscript.replace(
subscript.begin() + cnt_before,
subscript.begin() + cnt_before + 3,
@@ -721,9 +733,9 @@ std::pair<std::vector<PathNode>, PathInfo> einsum_path_helper(
};
for (int i = 0; i < operands.size(); i++) {
check_letters_and_expand_ellipsis(in_subscripts[i], &operands[i]);
check_letters_and_expand_ellipsis(in_subscripts[i], &operands[i], i);
}
check_letters_and_expand_ellipsis(out_subscript, nullptr);
check_letters_and_expand_ellipsis(out_subscript, nullptr, -1);
CharSet out_set(out_subscript.begin(), out_subscript.end());
if (out_set.size() != out_subscript.size()) {