[0-size Tensor Job2 No.38] Add 0-size Tensor support for index_sample

paddle/phi/infermeta/binary.cc

@@ -2356,7 +2356,7 @@ void IndexSampleInferMeta(const MetaTensor& x,
           "Inputs(Index) shape of IndexSample op should be 2-D, but "
           "got Index's shape [%s] , please check index shape.",
           input_dims));
-  if (config.is_runtime) {
+  if (config.is_runtime && index_dims[0] != 0) {  // 0-size not check
     PADDLE_ENFORCE_EQ(input_dims[0],
                       index_dims[0],
                       errors::InvalidArgument(

paddle/phi/kernels/cpu/index_sample_kernel.cc

@@ -88,6 +88,9 @@ void IndexSampleKernel(const Context &dev_ctx,
                        const DenseTensor &index,
                        DenseTensor *out) {
   dev_ctx.template Alloc<T>(out);
+  if (out && out->numel() == 0) {
+    return;
+  }
   auto index_type = index.dtype();
   bool index_type_match =
       index_type == DataType::INT32 || index_type == DataType::INT64;

paddle/phi/kernels/gpu/index_sample_grad_kernel.cu

@@ -102,6 +102,7 @@ void IndexSampleGradKernel(const Context& dev_ctx,
   phi::funcs::SetConstant<Context, T> set_zero;
   set_zero(dev_ctx, x_grad, static_cast<T>(0));
 
+  if (out_grad.numel() == 0) return;
   if (index_type == DataType::INT64) {
     const int64_t* index_data = index.data<int64_t>();
     IndexSampleGrad<T, int64_t>

paddle/phi/kernels/gpu/index_sample_kernel.cu

@@ -69,6 +69,9 @@ void IndexSampleKernel(const Context& dev_ctx,
                         DataTypeToString(DataType::INT64)));
   const T* in_data = x.data<T>();
   T* out_data = dev_ctx.template Alloc<T>(out);
+  if (out && out->numel() == 0) {
+    return;
+  }
   auto stream = reinterpret_cast<const phi::GPUContext&>(dev_ctx).stream();
   auto input_dim = x.dims();
   auto index_dim = index.dims();

paddle/phi/kernels/xpu/index_sample_kernel.cc

@@ -24,6 +24,10 @@ void IndexSampleKernel(const Context& dev_ctx,
                        const DenseTensor& x,
                        const DenseTensor& index,
                        DenseTensor* out) {
+  if (out && out->numel() == 0) {
+    dev_ctx.template Alloc<T>(out);
+    return;
+  }
   auto index_type = index.dtype();
   bool index_type_match =
       index_type == DataType::INT32 || index_type == DataType::INT64;

test/legacy_test/test_index_sample_op.py

@@ -129,6 +129,52 @@ def config(self):
         self.index_type = "int64"
 
 
+class TestIndexSampleOp_ZeroSize(OpTest):
+    def setUp(self):
+        self.op_type = "index_sample"
+        self.python_api = paddle.index_sample
+        self.public_python_api = paddle.index_sample
+        self.config()
+        xnp = np.random.random(self.x_shape).astype(self.x_type)
+        if self.x_type == np.complex64 or self.x_type == np.complex128:
+            xnp = (
+                np.random.random(self.x_shape)
+                + 1j * np.random.random(self.x_shape)
+            ).astype(self.x_type)
+        indexnp = np.random.randint(
+            low=0, high=self.x_shape[1], size=self.index_shape
+        ).astype(self.index_type)
+        self.inputs = {'X': xnp, 'Index': indexnp}
+        index_array = []
+        for i in range(self.index_shape[0]):
+            for j in indexnp[i]:
+                index_array.append(xnp[i, j])
+        index_array = np.array(index_array).astype(self.x_type)
+        out = np.reshape(index_array, self.index_shape)
+        self.outputs = {'Out': out}
+
+    def test_check_output(self):
+        self.check_output(check_pir=True)
+
+    def test_check_grad(self):
+        self.check_grad(['X'], 'Out', check_pir=True)
+
+    def config(self):
+        self.x_shape = (10, 20)
+        self.x_type = "float64"
+        self.index_shape = (10, 0)
+        self.index_type = "int32"
+
+
+class TestIndexSampleOp_ZeroSize2(TestIndexSampleOp_ZeroSize):
+
+    def config(self):
+        self.x_shape = (0, 20)
+        self.x_type = "float64"
+        self.index_shape = (0, 0)
+        self.index_type = "int32"
+
+
 @unittest.skipIf(core.is_compiled_with_xpu(), "complex is not supported on XPU")
 class TestIndexSampleComplex64(TestIndexSampleOp):
     def config(self):