update requires to seperate opencl and eigen var_value cases

Author: SteveBronder

stan/math/rev/fun/log_inv_logit.hpp

@@ -13,14 +13,29 @@ namespace math {
  * Return the natural logarithm of the inverse logit of the
  * specified argument.
  *
- * @param u argument
+ * @tparam T An arithmetic type
+ * @param u `var_value` with inner arithmetic type
  * @return log inverse logit of the argument
  */
-template <typename T>
+template <typename T, require_arithmetic_t<T>* = nullptr>
 inline auto log_inv_logit(const var_value<T>& u) {
   return make_callback_var(log_inv_logit(u.val()), [u](auto& vi) mutable {
-    as_array_or_scalar(u.adj()) += as_array_or_scalar(vi.adj())
-                                   * as_array_or_scalar(inv_logit(-u.val()));
+    u.adj() += vi.adj() * inv_logit(-u.val());
+  });
+}
+
+/**
+ * Return the natural logarithm of the inverse logit of the
+ * specified argument.
+ *
+ * @tparam T A type derived from `Eigen::EigenBase`
+ * @param u `var_value` with inner Eigen type
+ * @return log inverse logit of the argument
+ */
+template <typename T, require_eigen_t<T>* = nullptr>
+inline auto log_inv_logit(const var_value<T>& u) {
+  return make_callback_var(log_inv_logit(u.val()), [u](auto& vi) mutable {
+    u.adj().array() += vi.adj().array() * inv_logit(-u.val()).array();
   });
 }