Python UnivariateSpline.deriv_2方法代码示例

# 需要导入模块: from scipy.interpolate import UnivariateSpline [as 别名]
# 或者: from scipy.interpolate.UnivariateSpline import deriv_2 [as 别名]

#.........这里部分代码省略.........

		# for each parameter (accelX, accelY, ...)

                # map the unicode character to int
                curr_stroke_val = stroke_dict[data1[i][0]]
                                        
                #print(len(curr_stroke))
                #print(curr_stroke[0])
                #print(curr_stroke[1])

		curr_data = data1[i][1]

                # fix if too short for interpolation - pad current data with 3 zeros
                if(len(curr_data) <= 3):
                        curr_data = np.concatenate([curr_data, np.zeros((3,num_params))])

		time = np.arange(0, len(curr_data), 1) # the sample 'times' (0 to number of samples)
		time_new = np.arange(0, len(curr_data), float(len(curr_data))/num_resamplings) # the resampled time points

		for j in range(0, num_params): # iterate through parameters

			signal = curr_data[:,j] # one signal (accelx, etc.) to interpolate
			# interpolate the signal using a spline or so, so that arbitrary points can be used 
			# (~30 seems reasonable based on data, for example)
                        
			#tck = interpolate.splrep(time, signal, s=0)  # the interpolation represenation
                        tck = UnivariateSpline(time, signal, s=0)

			# sample the interpolation num_resamplings times to get values
                        # resampled_data = interpolate.splev(time_new, tck, der=0) # the resampled data
                        resampled_data = tck(time_new)

                        # scale data (center, norm)
                        resampled_data = preprocessing.scale(resampled_data)
                        
                        # first integral
                        tck.integral = tck.antiderivative()
                        resampled_data_integral = tck.integral(time_new)

                        # scale data (center, norm)
                        resampled_data_integral = preprocessing.scale(resampled_data_integral)

                        # 2nd integral
                        tck.integral_2 = tck.antiderivative(2)
                        resampled_data_integral_2 = tck.integral_2(time_new)

                        # scale data (center, norm)
                        resampled_data_integral_2 = preprocessing.scale(resampled_data_integral_2)

                        # first deriv
                        tck.deriv = tck.derivative()
                        resampled_data_deriv = tck.deriv(time_new)

                        # scale
                        resampled_data_deriv = preprocessing.scale(resampled_data_deriv)

                        # second deriv
                        tck.deriv_2 = tck.derivative(2)
                        resampled_data_deriv_2 = tck.deriv_2(time_new)

                        #scale
                        resampled_data_deriv_2 = preprocessing.scale(resampled_data_deriv_2)


                        # concatenate into one vector
                        concatenated_resampled_data = np.concatenate((resampled_data, 
                                                                      resampled_data_integral, 
                                                                      resampled_data_integral_2, 
                                                                      resampled_data_deriv, 
                                                                      resampled_data_deriv_2))
                        
                        # store for the correct parameter, to be used later as part of inputs to SVM
 			X_matrix[j] = concatenated_resampled_data

			# while we're at it, square vector of resampled data to get a matrix, vectorize the matrix, and store
			#  for each X in list, multiply X by itself -> X_2
			#- vectorize X^2 (e.g. 10 x 10 -> 100 dimensions)
#			X_2_matrix = np.outer(concatenated_resampled_data, concatenated_resampled_data) # temp matrix for outer product
#			X_2_vector = np.reshape(X_2_matrix, -1) # reshape into a vector

			#- center and normalize X^2 by mean and standard deviation
#			X_2_vector_scaled[j] = preprocessing.scale(X_2_vector) 

			#- concatenate with input X -> 110 dimensions
#			concatenated_X_X_2[j] = np.concatenate([X_matrix[j], X_2_vector_scaled[j]])

# FOR NOW, ONLY USE X, NOT OUTER PRODUCT
			concatenated_X_X_2[j] = X_matrix[j]

                # NOTE, THIS SHOULD REALLY JUST BE A BIG VECTOR FOR EACH STROKE, SO RESHAPE BEFORE ADDING TO OUTPUT LIST
                # ALSO, THE STROKE VALUE SHOULD BE ADDED
                this_sample = np.concatenate((np.reshape(concatenated_X_X_2, -1), np.array([curr_stroke_val])))
                concatenated_samples = np.reshape(this_sample, -1)

                # ADD TO OUTPUT ARRAY
                output_array[i] = concatenated_samples
        
        print(output_array.size)
        
	return(output_array)