Extend data file support for other pybindings

extension/pybindings/pybindings.cpp

@@ -161,10 +161,24 @@ void setup_output_storage(
 inline std::unique_ptr<Module> load_module_from_buffer(
     const void* ptr,
     size_t ptr_len,
+    std::optional<const void*> data_map_ptr,
+    std::optional<size_t> data_map_len,
     std::unique_ptr<runtime::EventTracer> event_tracer,
     Program::Verification program_verification) {
   EXECUTORCH_SCOPE_PROF("load_module_from_buffer");
   auto loader = std::make_unique<BufferDataLoader>(ptr, ptr_len);
+
+  if (data_map_ptr.has_value() && data_map_len.has_value()) {
+    auto data_map_loader = std::make_unique<BufferDataLoader>(
+        data_map_ptr.value(), data_map_len.value());
+    return std::make_unique<Module>(
+        std::move(loader),
+        nullptr, // memory_allocator
+        nullptr, // temp_allocator
+        std::move(event_tracer), // event_tracer
+        std::move(data_map_loader)); // data_map_loader
+  }
+
   return std::make_unique<Module>(
       std::move(loader),
       nullptr, // memory_allocator
@@ -504,6 +518,7 @@ struct PyMethodMeta final {
 struct PyModule final {
   explicit PyModule(
       const py::bytes& buffer,
+      std::optional<const py::bytes> data_map_buffer,
       bool enable_etdump,
       size_t debug_buffer_size = 0,
       Program::Verification program_verification =
@@ -512,12 +527,21 @@ struct PyModule final {
         module_(load_module_from_buffer(
             buffer.cast<std::string_view>().data(),
             py::len(buffer),
+            data_map_buffer.has_value()
+                ? std::optional<const void*>(
+                      data_map_buffer.value().cast<std::string_view>().data())
+                : std::nullopt,
+            data_map_buffer.has_value()
+                ? std::optional<size_t>(py::len(data_map_buffer.value()))
+                : std::nullopt,
             setup_event_tracer(enable_etdump, debug_buffer_size),
             program_verification)) {}
 
   explicit PyModule(
       const void* ptr,
       size_t ptr_len,
+      std::optional<const void*> data_map_ptr,
+      std::optional<size_t> data_map_ptr_len,
       bool enable_etdump,
       size_t debug_buffer_size = 0,
       Program::Verification program_verification =
@@ -526,6 +550,8 @@ struct PyModule final {
         module_(load_module_from_buffer(
             ptr,
             ptr_len,
+            data_map_ptr,
+            data_map_ptr_len,
             setup_event_tracer(enable_etdump, debug_buffer_size),
             program_verification)) {}
 
@@ -551,12 +577,17 @@ struct PyModule final {
   // Module is only valid as long as the python buffer is alive.
   static std::unique_ptr<PyModule> load_from_buffer(
       const py::bytes& buffer,
+      std::optional<const py::bytes> data_map_buffer,
       bool enable_etdump,
       size_t debug_buffer_size = 0,
       Program::Verification program_verification =
           Program::Verification::InternalConsistency) {
     return std::make_unique<PyModule>(
-        buffer, enable_etdump, debug_buffer_size, program_verification);
+        buffer,
+        data_map_buffer,
+        enable_etdump,
+        debug_buffer_size,
+        program_verification);
   }
 
   static std::unique_ptr<PyModule> load_from_file(
@@ -576,13 +607,25 @@ struct PyModule final {
 
   static std::unique_ptr<PyModule> load_from_bundled_program(
       PyBundledModule& m,
+      std::optional<const py::bytes> data_map_buffer,
       bool enable_etdump,
       size_t debug_buffer_size = 0) {
+    std::optional<const void*> data_map_ptr = std::nullopt;
+    std::optional<size_t> data_map_len = std::nullopt;
+
+    if (data_map_buffer.has_value()) {
+      data_map_ptr = data_map_buffer.value().cast<std::string_view>().data();
+      data_map_len = py::len(data_map_buffer.value());
+    }
+
     return std::make_unique<PyModule>(
         m.get_program_ptr(),
         m.get_program_len(),
+        data_map_ptr,
+        data_map_len,
         enable_etdump,
-        debug_buffer_size);
+        debug_buffer_size,
+        Program::Verification::InternalConsistency);
   }
 
   py::list run_method(
@@ -1423,6 +1466,7 @@ PYBIND11_MODULE(EXECUTORCH_PYTHON_MODULE_NAME, m) {
       "_load_for_executorch_from_buffer",
       &PyModule::load_from_buffer,
       py::arg("buffer"),
+      py::arg("data_map_buffer") = std::nullopt,
       py::arg("enable_etdump") = false,
       py::arg("debug_buffer_size") = 0,
       py::arg("program_verification") =
@@ -1432,6 +1476,7 @@ PYBIND11_MODULE(EXECUTORCH_PYTHON_MODULE_NAME, m) {
       "_load_for_executorch_from_bundled_program",
       &PyModule::load_from_bundled_program,
       py::arg("ptr"),
+      py::arg("data_map_buffer") = std::nullopt,
       py::arg("enable_etdump") = false,
       py::arg("debug_buffer_size") = 0,
       call_guard);

extension/pybindings/pybindings.pyi

@@ -185,6 +185,7 @@ def _load_for_executorch(
 @experimental("This API is experimental and subject to change without notice.")
 def _load_for_executorch_from_buffer(
     buffer: bytes,
+    data_map_buffer: Optional[bytes] = None,
     enable_etdump: bool = False,
     debug_buffer_size: int = 0,
     program_verification: Verification = Verification.InternalConsistency,
@@ -199,7 +200,10 @@ def _load_for_executorch_from_buffer(
 
 @experimental("This API is experimental and subject to change without notice.")
 def _load_for_executorch_from_bundled_program(
-    module: BundledModule, enable_etdump: bool = False, debug_buffer_size: int = 0
+    module: BundledModule,
+    data_map_buffer: Optional[bytes] = None,
+    enable_etdump: bool = False,
+    debug_buffer_size: int = 0,
 ) -> ExecuTorchModule:
     """Same as _load_for_executorch, but takes a bundled program instead of a file path.
 

extension/pybindings/test/TARGETS

@@ -17,6 +17,9 @@ runtime.python_library(
     deps = [
         "//caffe2:torch",
         "//caffe2:torch_fx",
+        "//executorch/devtools/bundled_program:config",
+        "//executorch/devtools/bundled_program:core",
+        "//executorch/devtools/bundled_program/serialize:lib",
         "//executorch/exir:lib",
         "//executorch/exir:pass_manager",
         "//executorch/exir:scalar_type",

extension/pybindings/test/test_pybindings.py

@@ -635,24 +635,84 @@ def test_program_data_separation(self) -> None:
                 external_constants=True,
             )
         )
+        program_buffer = exec_program.buffer
+        assert len(exec_program._tensor_data) == 1
+        data_buffer = bytes(exec_program._tensor_data.pop("_default_external_constant"))
 
         import os
         import tempfile
 
         with tempfile.TemporaryDirectory() as tmpdir:
             pte_file = os.path.join(tmpdir, "linear.pte")
             with open(pte_file, "wb") as f:
-                f.write(exec_program.buffer)
-
+                f.write(program_buffer)
             ptd_file = os.path.join(tmpdir, "linear.ptd")
             with open(ptd_file, "wb") as ptd:
-                tensor_data = bytes(
-                    exec_program._tensor_data.pop("_default_external_constant")
-                )
-                ptd.write(tensor_data)
+                ptd.write(data_buffer)
+            expected = eager_module(inputs[0])
+            # Test 1: File-based loading with external data file
+            executorch_module_file = self.runtime._load_for_executorch(
+                pte_file, ptd_file
+            )
+            executorch_output_file = executorch_module_file.forward(inputs)[0]
+            self.assertTrue(torch.allclose(expected, executorch_output_file))
 
-            executorch_program = self.runtime._load_for_executorch(pte_file, ptd_file)
+        # Test 2: Buffer-based loading with external data buffer
+        executorch_module_buffer = self.load_fn(program_buffer, data_buffer)
+        executorch_output_buffer = executorch_module_buffer.forward(inputs)[0]
+        self.assertTrue(torch.allclose(expected, executorch_output_buffer))
 
-            expected = eager_module(inputs[0])
-            executorch_output = executorch_program.forward(inputs)[0]
-            self.assertTrue(torch.allclose(expected, executorch_output))
+        # Test 3: Buffer-based loading without external data file (should fail or work differently)
+        # This should fail because the program expects external data
+        executorch_module_no_data = self.load_fn(program_buffer)
+        with self.assertRaises(RuntimeError):
+            executorch_module_no_data.forward(inputs)
+
+        # Test 4: Test with invalid data buffer (should fail)
+        invalid_bytes = b"invalid bytes"
+        executorch_module_invalid_data = self.load_fn(program_buffer, invalid_bytes)
+        with self.assertRaises(RuntimeError):
+            executorch_module_invalid_data.forward(inputs)
+
+        # Test 5: Test bundled program loading with external data
+        # First create a bundled program with external constants
+        from executorch.devtools.bundled_program.config import (
+            MethodTestCase,
+            MethodTestSuite,
+        )
+        from executorch.devtools.bundled_program.core import BundledProgram
+        from executorch.devtools.bundled_program.serialize import (
+            serialize_from_bundled_program_to_flatbuffer,
+        )
+
+        method_test_suites = [
+            MethodTestSuite(
+                method_name="forward",
+                test_cases=[
+                    MethodTestCase(
+                        inputs=input,
+                        expected_outputs=expected,
+                    )
+                    for input in inputs
+                ],
+            ),
+        ]
+        bundled_program = BundledProgram(exec_program, method_test_suites)
+        bundled_buffer = serialize_from_bundled_program_to_flatbuffer(bundled_program)
+        bundled_module = self.runtime._load_bundled_program_from_buffer(bundled_buffer)
+
+        # Load module from bundled program with external data
+        executorch_module_bundled = (
+            self.runtime._load_for_executorch_from_bundled_program(
+                bundled_module, data_buffer
+            )
+        )
+        executorch_output_bundled = executorch_module_bundled.forward(inputs)[0]
+        self.assertTrue(torch.allclose(expected, executorch_output_bundled))
+
+        # Test 6: Bundled program without external data should fail
+        executorch_module_bundled_no_data = (
+            self.runtime._load_for_executorch_from_bundled_program(bundled_module)
+        )
+        with self.assertRaises(RuntimeError):
+            executorch_module_bundled_no_data.forward(inputs)