gradient

问题 When implementing lambda-opt(an algorithm published on KDD'19) in tensorflow, I came across a problem to compute gradients with tf.scatter_sub 。 θ refers to an embedding matrix for docid. The formulation is θ(t+1)=θ(t) - α*(grad+2*λ*θ), delta = theta_grad_no_reg.values * lr + 2 * lr * cur_scale * cur_theta next_theta_tensor = tf.scatter_sub(theta,theta_grad_no_reg.indices,delta) then I use θ(t+1) for some computation. Finally, I want to compute gradients with respect to λ, not θ. But the

问题 I am working with depth images retrieved from kinect which are 16 bits. I found some difficulties on making my own filters due to the index or the size of the images. I am working with Textures because allows to work with any bit size of images. So, I am trying to compute an easy gradient to understand what is wrong or why it doesn't work as I expected. You can see that there is something wrong when I use y dir. For x: For y: That's my code: typedef concurrency::graphics::texture<unsigned int

问题 How do I create this button with Gradient Effect in Xamarin Forms using Renderer ? 回答1: In xamarin you can't add gradient colors as a built in feature. You have to create a different rendering feature. This link will guide you. 回答2: In Xamarin Forms Craets public class GradientColorStack:StackLayout { public Color StartColor { get; set; } public Color EndColor { get; set; } } And then Renderer Android public class GradientColorStackRenderer : VisualElementRenderer<StackLayout> { private Color

问题 Is it possible to draw a line using a graduated colour? I want to be able to draw a straight or a curved line (if possible) where at one end of the line is Blue and the other end is Red. Further There might be a need to have more than one gradient per-line e.g the colour going from Blue -> Green -> Red. I am thinking that this might just consist of multiple gradient lines drawn together. 回答1: protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); Graphics graphicsObject = e

问题 IE9 is apparently able to handle rounded corners by using the CSS3 standard definition of border-radius . What about support for border radius and background gradient? Yes IE9 is to support them both separately, but if you mix the two the gradient bleeds out of the rounded corner. I am also seeing strangeness with shadows showing as a solid black line under a box with rounded corners. Here are the images shown in IE9: How can I work around this problem? 回答1: Here's one solution that adds a

问题 I would like to have a gradient background in OpenGL I found these two links, but I cannot reproduce it: OpenGL gradient fill on iPhone looks striped OpenGL gradient banding on Android I tried the following of the first link: // Begin Render //IntBuffer redBits = null, greenBits = null, blueBits = null; //gl.glGetIntegerv (GL10.GL_RED_BITS, redBits); // ==> 8 //gl.glGetIntegerv (GL10.GL_GREEN_BITS, greenBits); // ==> 8 //gl.glGetIntegerv (GL10.GL_BLUE_BITS, blueBits); // ==> 8 gl.glDisable

问题 I would like to have a gradient background in OpenGL I found these two links, but I cannot reproduce it: OpenGL gradient fill on iPhone looks striped OpenGL gradient banding on Android I tried the following of the first link: // Begin Render //IntBuffer redBits = null, greenBits = null, blueBits = null; //gl.glGetIntegerv (GL10.GL_RED_BITS, redBits); // ==> 8 //gl.glGetIntegerv (GL10.GL_GREEN_BITS, greenBits); // ==> 8 //gl.glGetIntegerv (GL10.GL_BLUE_BITS, blueBits); // ==> 8 gl.glDisable

问题 I have an image A with shadow appearance in it and I have an image B which is of solid color. I want to copy shadows of image A to Image B from openCV in python. If I am not wrong it has something to do with gradient of the image? Image A Image B 回答1: You can do that easily with ImageMagick or Python Wand or with a bit more effort in Python/OpenCV. Note that Python Wand uses ImageMagick. ImageMagick is already available on most Linux distributions and is available for Windows and Mac OSX. The

问题 I am experimenting on this color control panel where a user can change the look and feel of the page using a slide in control panel. An added complexity is that the slide-in panel is in parent window where as the page that the changes are made to is inside an iframe. I want the changes to take affect as they are made inside the control panel. For this I don't want to use AJAX. For this I have devised an algorithm and it is working fine. Everything apart an issue with IE8 is working fine. I am

问题 Can I add the gradient filling to the XYPlot chart in JFreeChart? Example below: 回答1: I haven't tried it, but org.jfree.chart.renderer.xy.StackedXYAreaRenderer has a setSeriesFillPaint() method and java.awt.GradientPaint implements the Paint interface. 回答2: I found this works on an XYAreaRenderer plot.getRenderer().setSeriesPaint(seriesIndex, new GradientPaint(0.0f, 0.0f, new Color(255, 0, 0), 0.0f, 0.0f, new Color(0, 255, 255))); 回答3: Just share working code - fixed bugs in other publicly