license import { KernelConfig , Sigmoid } from '@tensorflow/tfjs-core' ; import { CHECK_NAN_SNIPPET_UNARY , unaryKernelFunc } from '../kernel_utils/kernel_funcs_utils' ; import { sigmoidImplCPU } from '../kernel_utils/shared' ; const SIGMOID = CHECK_NAN_SNIPPET_UNARY + `
  return 1.0 / (1.0 + exp(-1.0 * x));
` ; const SIGMOID_PACKED = `
  vec4 result = 1.0 / (1.0 + exp(-1.0 * x));
  bvec4 isNaN = isnan(x);

  result.r = isNaN.r ? x.r : result.r;
  result.g = isNaN.g ? x.g : result.g;
  result.b = isNaN.b ? x.b : result.b;
  result.a = isNaN.a ? x.a : result.a;

  return result;
` ; export const sigmoid = unaryKernelFunc ( { opSnippet : SIGMOID , packedOpSnippet : SIGMOID_PACKED , cpuKernelImpl : sigmoidImplCPU } ) ; export const sigmoidConfig = { kernelName : Sigmoid , backendName : 'webgl' , kernelFunc : sigmoid , } ;