Fix reshape bug (#16069)

* In some case, the input may have one than one negative value.
test=develop

* fix matmul bug
test=develop

paddle/fluid/operators/reshape_op.cc

@@ -56,6 +56,9 @@ class ReshapeOp : public framework::OperatorWithKernel {
   static framework::DDim ValidateShape(const std::vector<int> shape,
                                        const framework::DDim &in_dims) {
     const int64_t in_size = framework::product(in_dims);
+    auto in_dims_vec = framework::vectorize(in_dims);
+    bool all_positive = std::all_of(in_dims_vec.cbegin(), in_dims_vec.cend(),
+                                    [](int64_t i) { return i > 0; });
     // only one dimension can be set to -1, whose size will be automatically
     // infered.
     const int64_t unk_dim_val = -1;
@@ -88,7 +91,7 @@ class ReshapeOp : public framework::OperatorWithKernel {
     }
 
     if (unk_dim_idx != -1) {
-      if (in_size > 0) {
+      if (all_positive) {
         // in_size < 0 and is un-determinate in compile time, skip the check,
         // for example, in_dims = [-1, 8, 1, 1], shape = [-1, 3, 8],
         // capacity = -24, in_size = -8, output_shape[0] = 0

python/paddle/fluid/layers/nn.py

@@ -4833,11 +4833,6 @@ def matmul(x, y, transpose_x=False, transpose_y=False, alpha=1.0, name=None):
     """
 
     def __check_input(x, y):
-        if len(y.shape) > len(x.shape):
-            raise ValueError(
-                "Invalid inputs for matmul. "
-                "x's rank should be always greater than or equal to y'rank.")
-
         x_shape = list(x.shape)
         y_shape = list(y.shape)
         if len(x_shape) == 1:
@@ -4853,10 +4848,11 @@ def matmul(x, y, transpose_x=False, transpose_y=False, alpha=1.0, name=None):
         if x_shape[-1] != y_shape[-2]:
             raise ValueError("Invalid inputs for matmul.")
 
-        if len(y_shape) > 2:
+        if len(y_shape) > 2 and len(x_shape) > 2:
             for i, dim_x in enumerate(x_shape[:-2]):
                 if dim_x != y_shape[i]:
-                    raise ValueError("Invalid inputs for matmul.")
+                    raise ValueError("Invalid inputs for matmul. x(%s), y(%s)" %
+                                     (x.shape, y.shape))
 
     __check_input(x, y)