From 643079037a4cc54f6f2d8e4038ba2e9891ae79c6 Mon Sep 17 00:00:00 2001
From: Weilong Wu <veyron_wu@163.com>
Date: Mon, 17 Oct 2022 17:10:37 +0800
Subject: [PATCH] support __floordiv__ (#47060)

---
 paddle/fluid/pybind/eager_math_op_patch.cc   | 94 ++++++++++++++++++++
 python/paddle/fluid/dygraph/math_op_patch.py |  3 +-
 2 files changed, 95 insertions(+), 2 deletions(-)

diff --git a/paddle/fluid/pybind/eager_math_op_patch.cc b/paddle/fluid/pybind/eager_math_op_patch.cc
index a5cd16dd927..4cd76f4a104 100644
--- a/paddle/fluid/pybind/eager_math_op_patch.cc
+++ b/paddle/fluid/pybind/eager_math_op_patch.cc
@@ -1295,6 +1295,96 @@ static PyObject* tensor__le__method(TensorObject* self,
   EAGER_CATCH_AND_THROW_RETURN_NULL
 }
 
+static PyObject* tensor__floordiv__method(TensorObject* self,
+                                          PyObject* args,
+                                          PyObject* kwargs) {
+  paddle::platform::RecordEvent pythonc_record_event(
+      "floordiv pybind_patch_func",
+      paddle::platform::TracerEventType::UserDefined,
+      1);
+  EAGER_TRY
+  VLOG(6) << "Running Eager tensor__floordiv__method";
+
+  // Set Device ID
+  auto place = egr::Controller::Instance().GetExpectedPlace();
+  SetDevice(place);
+
+  paddle::experimental::Tensor ret;
+  paddle::experimental::Tensor self_tensor = self->tensor;
+
+  PyObject* other_obj = PyTuple_GET_ITEM(args, 0);
+
+  // 1. scalar exists cases or not
+  // there is no scalar case for floordiv, but alse need to cast self_tensor
+  // in need.
+  double other_double = 0.0;
+  bool has_other_double = false;
+  if (PyFloat_Check(other_obj) || PyCheckInteger(other_obj) ||
+      IsNumpyType(other_obj)) {
+    if (PyFloat_Check(other_obj)) {
+      other_double = CastPyArg2Double(other_obj, "__floordiv__", 0);
+      has_other_double = true;
+      if (_supported_int_dtype_.find(self_tensor.dtype()) !=
+          _supported_int_dtype_.end()) {
+        eager_gil_scoped_release guard;
+        self_tensor = cast_ad_func(self_tensor, DataType::FLOAT32);
+      }
+    } else if (PyCheckInteger(other_obj) || IsNumpyType(other_obj)) {
+      other_double = CastPyArg2Double(other_obj, "__floordiv__", 0);
+      has_other_double = true;
+    }
+  }
+
+  // 2. create or get tensor for other_obj
+  paddle::experimental::Tensor other_tensor;
+  if (has_other_double) {
+    eager_gil_scoped_release guard;
+    other_tensor = full_ad_func(self_tensor.shape(),
+                                phi::Scalar(other_double),
+                                self_tensor.dtype(),
+                                self_tensor.place());
+  } else if (!PyCheckTensor(other_obj)) {
+    paddle::experimental::Scalar value =
+        CastPyArg2Scalar(other_obj, "__floordiv__", 0);
+    if (PyComplex_Check(other_obj)) {
+      eager_gil_scoped_release guard;
+      other_tensor =
+          full_ad_func({1}, value, DataType::COMPLEX64, self_tensor.place());
+    } else {
+      eager_gil_scoped_release guard;
+      other_tensor =
+          full_ad_func({1}, value, self_tensor.dtype(), self_tensor.place());
+    }
+  } else {
+    other_tensor = CastPyArg2Tensor(other_obj, 0);
+  }
+
+  // 3. promote types or unify right var type to left var
+  phi::DataType lhs_dtype = self_tensor.dtype();
+  phi::DataType rhs_dtype = other_tensor.dtype();
+  if (lhs_dtype != rhs_dtype) {
+    // note: only op_type in _supported_promote_complex_types_ should promote
+    // dtype, floordiv is not in _supported_promote_complex_types_, will not do
+    // promote dtype
+    VLOG(6) << "The dtype of left and right Tensor are not the same, left "
+               "dtype is "
+            << lhs_dtype << ", but right dtype is " << rhs_dtype
+            << ", the right dtype will convert to " << lhs_dtype;
+    eager_gil_scoped_release guard;
+    other_tensor = cast_ad_func(other_tensor, lhs_dtype);
+  }
+
+  // 4. calculation
+  VLOG(6) << "Calling floor_divide_ad_func in tensor__floordiv__method";
+  {
+    eager_gil_scoped_release guard;
+    ret = floor_divide_ad_func(self_tensor, other_tensor);
+  }
+
+  return ToPyObject(ret);
+  EAGER_CATCH_AND_THROW_RETURN_NULL
+}
+
 PyMethodDef math_op_patch_methods[] = {
     {"__add__",
      (PyCFunction)(void (*)(void))tensor__add__method,
@@ -1336,6 +1426,10 @@ PyMethodDef math_op_patch_methods[] = {
      (PyCFunction)(void (*)(void))tensor__rdiv__method,
      METH_VARARGS | METH_KEYWORDS,
      NULL},
+    {"__floordiv__",
+     (PyCFunction)(void (*)(void))tensor__floordiv__method,
+     METH_VARARGS | METH_KEYWORDS,
+     NULL},
     {"__mod__",
      (PyCFunction)(void (*)(void))tensor__mod__method,
      METH_VARARGS | METH_KEYWORDS,
diff --git a/python/paddle/fluid/dygraph/math_op_patch.py b/python/paddle/fluid/dygraph/math_op_patch.py
index 72e770e8e50..f754fb93c45 100644
--- a/python/paddle/fluid/dygraph/math_op_patch.py
+++ b/python/paddle/fluid/dygraph/math_op_patch.py
@@ -392,8 +392,6 @@ def monkey_patch_math_varbase():
                                      True)),
         ('__rpow__', _binary_creator_('__rpow__', 'elementwise_pow', True,
                                       None)),
-        ('__floordiv__',
-         _binary_creator_('__floordiv__', 'floor_divide', False, None, True)),
         # for logical compare
         ('__eq__', _binary_creator_('__eq__', 'equal', False, None, True)),
         ('__ne__', _binary_creator_('__ne__', 'not_equal', False, None, True)),
@@ -417,6 +415,7 @@ def monkey_patch_math_varbase():
         '__ge__',
         '__lt__',
         '__le__',
+        '__floordiv__',
     ]
 
     global _already_patch_varbase
-- 
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