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System information

• Have I written custom code (as opposed to using a stock example script provided in TensorFlow): yes
• OS Platform and Distribution (e.g., Linux Ubuntu 16.04): macOS 10.13.5
• Mobile device (e.g. iPhone 8, Pixel 2, Samsung Galaxy) if the issue happens on mobile device: N/A
• TensorFlow installed from (source or binary): pip
• TensorFlow version (use command below): 1.8.0
• Python version: 3.6
• Bazel version (if compiling from source): N/A
• GCC/Compiler version (if compiling from source): N/A
• CUDA/cuDNN version: N/A
• GPU model and memory: N/A
• Exact command to reproduce: N/A

You can collect some of this information using our environment capture script:

https://github.com/tensorflow/tensorflow/tree/master/tools/tf_env_collect.sh

You can obtain the TensorFlow version with

python -c "import tensorflow as tf; print(tf.GIT_VERSION, tf.VERSION)"

Describe the problem

Describe the problem clearly here. Be sure to convey here why it's a bug in TensorFlow or a feature request.
When using tf.contrib.image.interpolate_spline(), the input cannot have partially known shape, e.g., a placeholder. I wonder if new features to allow inputs with partially known shape can be added. The following is a code snippet to demonstrate the problem. Thank you for helping!

Source code / logs

Include any logs or source code that would be helpful to diagnose the problem. If including tracebacks, please include the full traceback. Large logs and files should be attached. Try to provide a reproducible test case that is the bare minimum necessary to generate the problem.

import tensorflow as tf

X = tf.placeholder(tf.float32, [None])
Y = tf.constant([4,5,6], tf.float32)
x2 = tf.constant([2.5,2.3,2.9], tf.float32)

x = tf.reshape([[X]], [1, -1, 1])
y = tf.reshape([[Y]], [1, -1, 1])
x2 = tf.reshape([[x2]], [1, -1, 1])
y2 = tf.contrib.image.interpolate_spline(x, y, x2, order=1)

with tf.Session() as session:
result = session.run(y2, feed_dict={X: [1, 2, 3]})
print(result[0,:,0])