大小必须是一维 int32 张量

Question

我有 MNIST 数据并在 R 中使用 Tensorflow 和 keras 进行一些转换

 dim(train_images) <- c(nrow(train_images), 28,28,1)
 dim(test_images) <- c(nrow(test_images), 28,28,1)

train_images <- tf$image$grayscale_to_rgb(tf$convert_to_tensor(train_images)) 
test_images <- tf$image$grayscale_to_rgb(tf$convert_to_tensor(test_images))

现在数据形状是：60000,28,28,3

但我需要形状数据：60000,32,32,3

train_images <- tf$image$resize(train_images, c(32,32))
test_images <-  tf$image$resize(test_images, c(32,32))

报错：

Error in py_call_impl(callable, dots$args, dots$keywords): ValueError: 'size' must be a 1-D int32      Tensor

  Detailed traceback: 
  File "/usr/local/share/.virtualenvs/r-reticulate/lib/python3.7/site-        packages/tensorflow/python/util/dispatch.py", line 201, in wrapper
return target(*args, **kwargs)
 File "/usr/local/share/.virtualenvs/r-reticulate/lib/python3.7/site-   packages/tensorflow/python/ops/image_ops_impl.py", line 1546, in resize_images_v2
skip_resize_if_same=False)
 File "/usr/local/share/.virtualenvs/r-reticulate/lib/python3.7/site-packages/tensorflow/python/ops/image_ops_impl.py", line 1226, in _resize_images_common
 raise ValueError('\'size\' must be a 1-D int32 Tensor')

Traceback:

1. tf$image$resize(train_images, c(32, 32))
2. py_call_impl(callable, dots$args, dots$keywords)

Answer 1

直接写吧：

train_images <- tf$image$resize(train_images, c(32L,32L))
test_images <-  tf$image$resize(test_images, c(32L,32L))