[Eager, Performance optimization] reduce_all interface move reduce_all flag...

[Eager, Performance optimization] reduce_all interface move reduce_all flag from python to C++ (#45744)

* [Eager, Performance optimization] move reduce_all flag from python to c++

* polish reduce_all

* fix ci error

* fix errors

paddle/phi/kernels/reduce_all_kernel.cc

@@ -26,6 +26,9 @@ void AllKernel(const Context& dev_ctx,
                bool keep_dim,
                DenseTensor* out) {
   bool reduce_all = false;
+  if (dims.size() == 0 || static_cast<int>(dims.size()) == x.dims().size()) {
+    reduce_all = true;
+  }
   AllRawKernel<T>(dev_ctx, x, dims, keep_dim, reduce_all, out);
 }
 

python/paddle/fluid/layers/nn.py

@@ -5032,6 +5032,10 @@ def reduce_all(input, dim=None, keep_dim=False, name=None):
     """
     if dim is not None and not isinstance(dim, list):
         dim = [dim]
+
+    if in_dygraph_mode():
+        return _C_ops.all(input, dim if dim != None else [], keep_dim)
+
     check_variable_and_dtype(input, 'input', ('bool'), 'reduce_all')
     helper = LayerHelper('reduce_all', **locals())
     out = helper.create_variable_for_type_inference(dtype=helper.input_dtype())