[Zero-Dim] support input 0D Tensor for equal_all (#49845)

* add zero dims test

* update code

* fix zero dims

* update code

paddle/phi/infermeta/binary.cc

@@ -381,7 +381,11 @@ void CompareAllInferMeta(const MetaTensor& x,
       errors::InvalidArgument(
           "The size of dim_y should not be greater than dim_x's."));
   out->share_lod(x);
+  if (!x.dims().size() || !y.dims().size()) {
+    out->set_dims(make_ddim({}));
+  } else {
     out->set_dims(make_ddim({1}));
+  }
   out->set_dtype(DataType::BOOL);
 }
 

python/paddle/fluid/tests/unittests/test_zero_dim_tensor.py

@@ -1255,6 +1255,13 @@ class TestSundryAPI(unittest.TestCase):
         y = paddle.full([], 0.6)
         self.assertFalse(paddle.allclose(x, y))
 
+    def test_equalall(self):
+        x = paddle.full([], 0.5)
+        y = paddle.full([], 0.6)
+        out = paddle.equal_all(x, y)
+        self.assertEqual(out.shape, [])
+        self.assertFalse(out)
+
     def test_where(self):
         x1 = paddle.full([], 1)
         x2 = paddle.full([], 2)

python/paddle/fluid/tests/unittests/xpu/test_zero_dim_tensor_xpu.py

@@ -780,6 +780,13 @@ class TestSundryAPI(unittest.TestCase):
         y = paddle.full([], 0.6)
         self.assertFalse(paddle.allclose(x, y))
 
+    def test_equalall(self):
+        x = paddle.full([], 0.5)
+        y = paddle.full([], 0.6)
+        out = paddle.equal_all(x, y)
+        self.assertEqual(out.shape, [])
+        self.assertFalse(out)
+
 
 # Use to test API whose zero-dim input tensors don't have grad and not need to test backward in OpTest.