简单非线性回归的Keras预测

这让我抓狂。我想用Keras来预测压力传感器的g值。我创建了这个代码来预测基于我测量的电压输出的值。准确度很低，据我所知，这是由于数据样本较小。因此，预测输出质量相当低，这目前是可以的
我不明白的是：我试图预测一个值，结果完全不正确，即当我输入3.4时，结果约为10，而应该在1000左右。当我在输入数组X_new中放入更多值时，结果质量会急剧提高(已经有两个值了(。我在这里错过了什么？如有任何意见，我们将不胜感激
这是我的代码：

import numpy as np
from sklearn import preprocessing, model_selection
from matplotlib import pyplot
from keras.layers import Dense, Activation, LSTM
from keras.models import Sequential, load_model
X = np.array([0.9,  1.75,   2.25,   2.45,   2.7,    2.9,    3.08,   3.2,    3.32,   3.4,    3.45])
y = np.array([10,   100,    200,    300,    400,    500,    600,    700,    800,    900,    1000])
X_scaler = preprocessing.MinMaxScaler(feature_range=(0, 1))
y_scaler = preprocessing.MinMaxScaler(feature_range=(0, 1))
X_scaled = (X_scaler.fit_transform(X.reshape(-1, 1)))
y_scaled = (y_scaler.fit_transform(y.reshape(-1, 1)))
X_train, X_test, y_train, y_test = model_selection.train_test_split(X_scaled, y_scaled, test_size=0.4, random_state=3)
model = Sequential()
model.add(Dense(128, input_shape=(1,), activation='relu'))
model.add(Dense(64, activation='relu'))
model.add(Dense(64, activation='relu'))
model.add(Dense(1))
model.compile(loss='mse', optimizer='adam', metrics=["accuracy"])
np.random.seed(3)
model.fit(X_train, y_train, epochs=256, batch_size=2, verbose=2)
_, accuracy = model.evaluate(X_train, y_train)
print('Accuracy: %.2f' % (accuracy*100))
model.save("workload_model/model.h5")
predicted = model.predict(X_test)
pyplot.plot(y_scaler.inverse_transform(y_train), color="red")
pyplot.plot(y_scaler.inverse_transform(predicted), color="blue")
pyplot.plot(y_scaler.inverse_transform(y_test), color="green")
print("X=%snPredicted=%s" % (X_scaler.inverse_transform(X_test), y_scaler.inverse_transform(predicted)))
# Test with new value
loaded_model = load_model("workload_model/model.h5")
X_new = np.array([3.4])
X_scaled = (X_scaler.fit_transform(X_new.reshape(-1, 1)))
predicted = loaded_model.predict(X_scaled)
print("X=%snPredicted=%s" % (X_scaler.inverse_transform(X_scaled), y_scaler.inverse_transform(predicted)))
pyplot.show()