Add support for Scipy v1.14 (#776)

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------------------------------------------------------------------------------------------------------------

**Context:**
SciPy v1.14 packages `libopenblas` as `libscipy_openblas` on Linux and
OpenBlas symbols are now exposed with a prefix `scipy_`.

**Description of the Change:**
Update `UtilLinearAlg.hpp` to check the library name before getting
openblas symbols.

**Benefits:**
Support `scipy` v0.14

**Possible Drawbacks:**

**Related GitHub Issues:**

---------

Co-authored-by: ringo-but-quantum <[email protected]>

Author: maliasadi

.github/CHANGELOG.md

@@ -134,6 +134,9 @@
 * Remove `pennylane.ops.op_math.controlled_decompositions.ctrl_decomp_zyz` tests with `len(control_wires) > 1`.
   [(#757)](https://github.com/PennyLaneAI/pennylane-lightning/pull/757)
 
+* Add support for Scipy v1.14.
+  [(#776)](https://github.com/PennyLaneAI/pennylane-lightning/pull/776)
+
 ### Contributors
 
 This release contains contributions from (in alphabetical order):

pennylane_lightning/core/_version.py

@@ -16,4 +16,4 @@
    Version number (major.minor.patch[-label])
 """
 
-__version__ = "0.37.0-dev46"
+__version__ = "0.37.0-dev47"

pennylane_lightning/core/src/utils/UtilLinearAlg.hpp

@@ -109,6 +109,12 @@ void compute_diagonalizing_gates(int n, int lda,
             ah[j * n + i] = Ah[i * lda + j];
         }
     }
+
+    // Scipy packages `libopenblas` as `libscipy_openblas` on Linux
+    // starting v1.14, and OpenBlas symbols are now exposed with
+    // a prefix `scipy_`.
+    auto scipy_prefix = false;
+
 #ifdef __APPLE__
     // LCOV_EXCL_START
     const std::string libName(SCIPY_LIBS_PATH);
@@ -182,6 +188,12 @@ void compute_diagonalizing_gates(int n, int lda,
             std::make_shared<SharedLibLoader>(libPath.string()));
     }
 
+    scipy_prefix =
+        std::find_if(availableLibs.begin(), availableLibs.end(),
+                     [](const auto &lib) {
+                         return lib.find("scipy_openblas") != std::string::npos;
+                     }) != availableLibs.end();
+
     blasLib = blasLibs.back();
 #endif
 
@@ -193,8 +205,8 @@ void compute_diagonalizing_gates(int n, int lda,
     int info;
 
     if constexpr (std::is_same<T, float>::value) {
-        cheevPtr cheev =
-            reinterpret_cast<cheevPtr>(blasLib->getSymbol("cheev_"));
+        auto cheev = reinterpret_cast<cheevPtr>(
+            blasLib->getSymbol(scipy_prefix ? "scipy_cheev_" : "cheev_"));
         // Query optimal workspace size
         cheev(&jobz, &uplo, &n, ah.data(), &lda, eigenVals.data(),
               work_query.data(), &lwork, rwork.data(), &info);
@@ -205,8 +217,8 @@ void compute_diagonalizing_gates(int n, int lda,
         cheev(&jobz, &uplo, &n, ah.data(), &lda, eigenVals.data(),
               work_optimal.data(), &lwork, rwork.data(), &info);
     } else {
-        zheevPtr zheev =
-            reinterpret_cast<zheevPtr>(blasLib->getSymbol("zheev_"));
+        auto zheev = reinterpret_cast<zheevPtr>(
+            blasLib->getSymbol(scipy_prefix ? "scipy_zheev_" : "zheev_"));
         // Query optimal workspace size
         zheev(&jobz, &uplo, &n, ah.data(), &lda, eigenVals.data(),
               work_query.data(), &lwork, rwork.data(), &info);